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  • 1. ALARIE, YVES
    et al.
    MICHAT, MARIANO C.
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    HÁJEK, JIŘÍ
    Morphology of the larvae of Rhantaticus congestus (Klug, 1833) and phylogenetic comparison with other known Aciliini (Coleoptera: Dytiscidae: Dytiscinae)2023Ingår i: Zootaxa, ISSN 1175-5326, E-ISSN 1175-5334, Vol. 5380, nr 3, s. 247-264Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We describe the second- and third instar larvae of the diving beetle Rhantaticus congestus (Klug, 1833), including detailed morphometric and chaetotaxic analyses of the cephalic capsule, head appendages, legs, terminal abdominal segment and urogomphi in order to discover useful characters for distinguishing Rhantaticus Sharp, 1882 larvae from those of other known Aciliini (Coleoptera: Dytiscidae: Dytiscinae). A parsimony analysis based on 94 larval characteristics of nine Aciliini species in five genera (Acilius Leach, 1817, Graphoderus Dejean, 1833, Rhantaticus, Sandracottus Sharp, 1882, Thermonectus Dejean, 1833) was conducted using the program TNT. Rhantaticus shares with all these genera several larval character states which support its inclusion in the Aciliini. Whereas Rhantaticus larva stands out from other known genera by several unique character states, our parsimony analysis did not recover any clear phylogenetic position of this genus within the Aciliini.

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  • 2. ALARIE, YVES
    et al.
    MICHAT, MARIANO C.
    RANARILALATIANA, TOLOTRA
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Larval morphology of the Madagascan endemic diving beetle genus Hovahydrus Biström, 1982 (Coleoptera: Dytiscidae) and phylogenetic comparison with other known Hyphydrini2022Ingår i: Zootaxa, ISSN 1175-5326, E-ISSN 1175-5334, Vol. 5219, nr 3, s. 227-246Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We describe for the first time the instar III larva of the diving beetle genus Hovahydrus Biström, 1982, based on H. praetextus (Guignot, 1951) and a new species yet to be described (identified here as Hovahydrus sp. near H. minutissimus (Régimbart, 1903)). We include detailed morphometric and chaetotaxic analyses of the cephalic capsule, head appendages, legs, last abdominal segment and urogomphi in order to discover useful characters for distinguishing Hovahydrus larvae from those of other known Hyphydrini (Coleoptera: Dytiscidae, Hydroporinae). A provisional parsimony analysis based on larval characteristics of 11 Hyphydrini species in eight genera was conducted using the program TNT. Larval morphology supports a close relationship between Hovahydrus, Hyphydrus Illiger, 1802, and the endemic South Africa genera Andex Sharp, 1882, Coelhydrus Sharp, 1882, Darwinhydrus Sharp, 1882 and Primospes Sharp, 1882. 

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  • 3.
    Balke, Michael
    et al.
    Zoologische Staatssammlung München.
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Hendrich, Lars
    Zoologische Staatssammlung München.
    A new genus and two new species of Southeast Asian Bidessini as well as new synonyms for Oceanian species (Coleoptera, Dytiscidae)2017Ingår i: ZooKeys, ISSN 1313-2989, E-ISSN 1313-2970, Vol. 647, s. 137-151Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Rompindessus jenisi Balke, Bergsten & Hendrich, gen. n. et sp. n. is described from near Rompin village in West Malaysia. The new genus is characterized by the presence of an occipital line and basal pronotal striae, the presence of a thick anterior bead on clypeus and two-segmented parameres as well as by the absence of basal elytral striae, the absence of sutural line on elytron, the absence of basal epipleural transverse carina, and the absence of longitudinal elytral carina. Moreover, male pro- and mesotarsus appear stout, and distinctly dilated laterally; the pronotum is comparably long and parallel-sided and the colour of beetle conspicuous dark orange. Leiodytes kualalipis Balke, Wang, Bergsten & Hendrich, sp. n. is described from West Malaysia (Pahang) and South Vietnam (Cat Tien). It is well characterized by its large size, elongate body and the form of the median lobe. Limbodessus fijiensis (J. Balfour-Browne, 1944), comb. n. described from Fiji is a new synonym of Limbodessus curviplicatus (Zimmermann, 1927) described from Samoa.

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  • 4.
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    A bee-fly's host, Facebook, and DNA Barcoding.2016Ingår i: Barcode Bulletin, Vol. 7, nr 2, s. 8-9Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 5.
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Coleoptera: Haliplidae, crawling water beetles2022Ingår i: The new natural history of Madagascar / [ed] Steven M. Goodman, Princeton: Princeton University Press, 2022, 1, s. 1041-1043Kapitel i bok, del av antologi (Övrigt vetenskapligt)
  • 6.
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Coleoptera: Hydroscaphidae, skiff beetles2022Ingår i: The new natural history of Madagascar / [ed] Steven M. Goodman, Princeton: Princeton University Press, 2022, 1, s. 1050-1051Kapitel i bok, del av antologi (Övrigt vetenskapligt)
  • 7.
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Coleoptera: Torridincolidae, torrent beetles2022Ingår i: The New Natural History of Madagascar / [ed] Steven M. Goodman, Princeton: Princeton University Press, 2022, 1, s. 1047-1049Kapitel i bok, del av antologi (Övrigt vetenskapligt)
  • 8.
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    DNA-streckkodning - så går det till2014Ingår i: Bi-lagan, nr 1, s. 14-16Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
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  • 9.
    Bergsten, Johannes
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Bjelke, Ulf
    Bergsten, J. & Bjelke U. 2018. Digital illustrerad bestämningsnyckel till Sveriges skräddare. I: Artnyckeln. ArtDatabanken, SLU, Uppsala. https://www.artnyckeln.se/type/gerridae-2000939-fullvuxna-skraddare.2018Övrigt (Övrig (populärvetenskap, debatt, mm))
  • 10.
    Bergsten, Johannes
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Elmqvist, Håkan
    Distoleon tetragrammicus (Fabricius, 1798) ny myrlejonslända för Norden och en illustrerad nyckel till arterna (Neuroptera: Myrmeleontidae).2022Ingår i: Entomologisk Tidskrift, ISSN 0013-886X, Vol. 143, nr 1-2, s. 25-37Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We report the first finding of the antlion Distoleon tetragrammicus (Fabricius, 1798) fromSweden. Several adults of the species have been collected or photographed on the island ofGotland in the Baltic Sea, between 2017 and 2021. The first finding is from Tofta skjutfält,a sandy military training ground vegetated with pines and mixed forests on the west coastof Gotland. Based on multi-year observations at the same locality as well as video recordingof an egglaying female it is clearly a resident population, even though larvae are yet to bedocumented. Distoleon tetragrammicus is not previously known from any of the Nordic orBaltic countries. The species is common in southern Europe with a wide distribution acrosswest palearctic and becomes rarer towards central Europe. The closest known locality isan outpost population on the Hel peninsula on the Polish Baltic coast which we speculateis the most probable source, 240km south of Gotland across the Baltic sea. Previously butthree species of antlions were known from the Nordic-Baltic countries, all belonging to thetypical pitfall trap-building tribe Myrmeleontini and subfamily Myrmeleontinae: Myrmeleonformicarius (Linnaeus, 1767), Myrmeleon bore (Tjeder, 1941) and Euroleon nostras (Geoffroyin Fourcroy, 1785). Distoleon tetragrammicus belongs to subfamily Nemoleontinae (tribeNemoleontini) with larvae being ambush predators without the behaviour of building pitfalltraps. We provide an identification key, as well as studio and field photographs of all fourNordic species. The quality and conservation value of Tofta military training ground localityfor insects is discussed with reference to other rare species.

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  • 11.
    Bergsten, Johannes
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Elmqvist, Håkan
    Nyström, Dennis
    Gräshoppan Aiolopus thalassinus– långvingad nykomling2020Ingår i: Fauna och flora : populär tidskrift för biologi, ISSN 0014-8903, Vol. 115, nr 4, s. 34-36Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 12.
    Bergsten, Johannes
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Göthberg, Anders
    Johansson, Karolina
    Pettersson, Arne
    Burkart, Werner
    Burkart, Gudrun
    Entomologmötet på Gotland 2017: temaexkursion med fokus på vattenlevande skalbaggar, skinnbaggar och trollsländor i Äskåkersvät.2017Ingår i: Entomologisk Tidskrift, ISSN 0013-886X, Vol. 139, nr 1, s. 39-49Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The yearly Swedish entomology meeting 2017 was organized by the local entomology

    society of Gotland, on the northern part of the Baltic island Gotland near Bunge, 4-6 August.

    One thematic excursion was focused on aquatic insects, especiallly aquatic beetles,

    bugs and dragonflies. A shallow pond, Äskåkersvät, with Characeae in an open grazed

    landscape with high natural values was studied. Äskåkersvät lies just adjacent to the larger

    area around lake Bästeträsk which is the focus of a pilot study evaluating its potential as

    a future national park. The pilot study is undertaken by Gotland County Administrative

    Board, the Swedish Environmental Protection Agency, Region Gotland and the Swedish

    Agency for Marine and Water Management. Here we give an annotated report of the 103

    species found: 69 species of water beetles (out of which 34 were Dytiscidae), 20 species

    of aquatic or semiaquatic bugs (out of which 10 were Corixidae), and 14 species of dragonflies.

    These include Hydrophilus piceus and H. aterrimus redlisted in Sweden (both as

    NT), and Dytiscus latissimus, globally redlisted (VU). We also noted the noble crayfish,

    Astacus astacus (redlisted as CR in Sweden) and the European medicinal leech Hirudo

    medicinalis (redlisted as NT globally). The blue emperor dragonfly (Anax imperator) was

    noted, a species first recorded from Gotland in 2002 and we present a graph on its increase

    and spreading on the island since. The number of species found in spite of a relatively

    modest collecting effort at a suboptimal time when many species may be in pupal stage out

    of water as witnessed by many teneral individuals, indicates a species rich locality with

    high natural value. The stoneworts (Characeae) vegetation certainly contributes to this, for

    instance vouched for by the occurrence of specialists as Haliplus confinis and H. obliquus

    whose larvae feed on stoneworts.

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  • 13.
    Bergsten, Johannes
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Lindberg, Gunvi
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Vårdal, hege
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Apelqvist, Niklas
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Brodin, Yngve
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Forshage, Mattias
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Arbetet med donationer av insektsamlingar vid Naturhistoriska Riksmuseet2014Ingår i: Entomologisk Tidskrift, ISSN 0013-886X, Vol. 134, s. 153-162Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
    Abstract [en]

    We describe the work with donated insect collections at the Swedish Museum of Natural

    History (NRM) in Stockholm, Sweden. The museum receives donations yearly from

    amateur entomologists, and they are an important contribution to the enrichment of the

    collections. For the collector it is satisfying that a public institution takes on the long term

    responsibility of safeguarding the scientific value in a collection, curating and making it

    available for study. Significant donations in the last years include that of Lars Huggert

    (Hymenoptera, Coleoptera), Hans Bartsch (Diptera) and Anders N. Nilsson (aquatic Coleoptera)

    to name a few. The curatorial and digitizing workload at the Entomology collection

    are unfortunately not matched by staff funding, and as at other European museums

    volunteer work constitute vital and invaluable help. We acknowledge especially some of

    the volunteer work in the Coleoptera and Hymenoptera collections. Recently we have engaged

    with amateur entomologists by organizing taxon-specific workshops at the museum

    which has stimulated exchange and collaboration. The Hymenoptera-day was visited by 30

    participants, and the Diptera-meeting by 49. As an example of what happens with a donation

    once it reaches the museum, we describe the work with a recent Coleoptera collection

    donation by Jan Olsson, Vallentuna. A few highlights from the unidentified material,

    including the Archostematan beetle Priacma serrata (Cupedidae) and the false jewelbeetle

    Schizopus laetus (Schizopodidae), are presented as they were new to the NRM collections.

    We also bring attention to two new websites: www.naturarv.se is the webportal presenting

    digitized material in Swedish natural history collections. Both metadata on specimens and

    photos are made searchable here. We also launch a new webpage at www.nrm.se/insektsdonationer

    where we write about new donations to the Entomology collections, with Jan

    Olsson’s Coleoptera collection first out.

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    Bergsten etal_2014_ET
  • 14.
    Bergsten, Johannes
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Manuel, Michael
    Coleoptera: Noteridae, burrowing water beetles2022Ingår i: The new natural history of Madagascar / [ed] Steven M. Goodman, Princeton: Princeton University Press, 2022, 1, s. 1044-1047Kapitel i bok, del av antologi (Övrigt vetenskapligt)
  • 15.
    Bergsten, Johannes
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Manuel, Michael
    Ranarilalatiana, Tolotra
    Ramahandrison, Andriamirado T.
    Hajek, Jiri
    Coleoptera: Dytiscidae, diving beetles, tsikovoka2022Ingår i: The new natural history of Madagascar / [ed] Steven M. Goodman, Princeton: Princeton University Press, 2022, 1, s. 1024-1034Kapitel i bok, del av antologi (Övrigt vetenskapligt)
  • 16.
    Bergsten, Johannes
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Nilsson, Lars G R
    Bukontaite, Rasa
    Naturhistoriska riksmuseet, Enheten för zoologi. Stockholm University.
    Åkerjordfly, Agrotis exclamationis, identifierad som värdart för svävflugan Villa hottentotta med hjälp av DNA streckkodning (Diptera: Bombyliidae).2015Ingår i: Entomologisk Tidskrift, ISSN 0013-886X, Vol. 136, nr 4, s. 121-130Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this study we identify Agrotis exclamationis (Linnaeus, 1758) as a host species for the bee y Villa hottentotta (Linnaeus, 1758) in Sweden. Host use and speci city for bee y species are generally very poorly known, why the hatching of a bee y of the genus Villa from an unknown Noctuid pupa caught our attention. The parasitized Noctuid pupa was found in a garden in Staffanstorp, Skåne (Sweden), in May 2015 and kept in a jar to hatch. The bee y hatched in June leaving two empty exuviae in the jar. DNA was extracted sepa- rately from both excuviae to identify the y and the host using DNA Barcoding. A 600+ bp long sequence of the gene Cytochrome oxidase subunit 1 was sequenced for both samples and queried against the reference library BOLD (www.boldsystems.org). The Noctuid host pupa was unambiguously identi ed as the common Noctuid species Agrotis exclamationis. The sequence was identical to the most common haplotype over much of Europe. The bee y pupa was identi ed as Villa hottentotta, the most common Villa species in Sweden. This added a new Noctuid species to the list of known hosts for V. hottentotta which also includes several other Noctuid genera as well as a Geometrid moth. Belonging to the sand chamber group of bee ies where the female scatter the eggs on the ground while hovering, the active host-seeking rst instar planidium larvae bene ts from having a wide host range to potentially encounter in the substrate zone. 

  • 17.
    Bergsten, Johannes
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Ranarilalatiana, Tolotra
    Biström, Olof
    A new species of Bidessus from Anjozorobe-Angavo and a review of Malagasy Bidessus (Coleoptera, Dytiscidae)2020Ingår i: European journal of taxonomy, E-ISSN 2118-9773, Vol. 720, nr 1, s. 1-18Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We review the species of Bidessus of Madagascar and describe Bidessus anjozorobe sp. nov. from material collected in Anjozorobe forest. Anjozorobe is part of the Anjozorobe-Angavo Protected Area, which is an important corridor of transition forest between typical eastern humid forests and the residual sub-humid forest of the Central Highlands. Bidessus longistriga Régimbart, 1895 and Bidessus perexiguus Kolbe, 1883 are widespread but endemic low-altitude species on Madagascar. Bidessus nesioticus Guignot, 1956 is an alpine species described from near the peak of the Ankaratra mountain massifs at 2500 m a.s.l. We recollected the species for the first time since its description, in Ankaratra and in a new area above 2000 m a.s.l. in the Andringitra mountain further south. Bidessus cf. nero Gschwendtner, 1933 is tentatively recorded for Madagascar for the first time but further studies are needed to test the status of mainland and insular populations. Bidessus apicidens Biström & Sanfilippo, 1986 has not been recollected on Madagascar since 1970. All species are endemic to Madagascar except potentially Bidessus cf. ceratus and Bidessus cf. nero described from Uganda and the Democratic Republic of the Congo, respectively. The older records of the two non-endemic species Bidessus complicatus Sharp, 1904 and Bidessus ovoideus Régimbart, 1895 on Madagascar could not be verified.

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  • 18.
    Bergsten, Johannes
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Weingartner, Elisabeth
    Stockholm University.
    Hajek, Jiri
    Species delimitation of the Hyphydrus ovatus complex in western Palaearctic with an update of species distributions (Coleoptera, Dytiscidae)2017Ingår i: ZooKeys, ISSN 1313-2989, E-ISSN 1313-2970, Vol. 678, s. 73-96Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The species status of Hyphydrus anatolicus Guignot, 1957 and H. sanctus Sharp, 1882, previously often confused with the widespread H. ovatus (Linnaeus, 1760), are tested with molecular and morphological characters. Cytochrome c oxidase subunit 1 (CO1) was sequenced for 32 specimens of all three species. Gene-trees were inferred with parsimony, time-free bayesian and strict clock bayesian analyses. The GMYC model was used to estimate species limits. All three species were reciprocally monophyletic with CO1 and highly supported. The GMYC species delimitation analysis unequivocally delimited the three species with no other than the three species solution included in the confidence interval. A likelihood ratio test rejected the one-species null model. Important morphological characters distinguishing the species are provided and illustrated. New distributional data are given for the following species: Hyphydrus anatolicus from Slovakia and Ukraine, and H. aubei Ganglbauer, 1891, and H. sanctus from Turkey.

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  • 19. Biström, Olof
    et al.
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    A new species of Peschetius GUIGNOT described from Sri Lanka (Coleoptera: Dytiscidae)2015Ingår i: Koleopterologische Rundschau, Vol. 85, s. 57-60Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Peschetius taprobanicus sp.n. (Coleoptera: Dytiscidae) is described on the basis of six specimens

    collected from Sri Lanka. Distinguishing characters are given for the new species.

  • 20. Biström, Olof
    et al.
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Two new species of the megadiverse lentic diving-beetle genus Hydrovatus (Coleoptera, Dytiscidae) described from NE Thailand.2016Ingår i: ZooKeys, ISSN 1313-2989, E-ISSN 1313-2970, nr 632, s. 57-66Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Here we describe two new Hydrovatus species (Coleoptera: Dytiscidae: Hydroporinae: Hydrovatini) from the province of Khon Kaen, Isan region in NE Thailand. Hydrovatus is the third most species rich genus of diving beetles (Dytiscidae). It occurs on all continents except Antarctica and now numbers 210 currently recognized species. Both new species, Hydrovatus diversipunctatussp. n. and Hydrovatus globosussp. n., were collected at lights and are only known from the type locality "Khon Kaen" (a city and province). Diagnoses based on morphology for the separation from closely related species are given together with illustrations of male genitalia and habitus photos. We provide a determination key to Old World species of the pustulatus species group and to Oriental species of the oblongipennis species group.

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  • 21. Biström, Olof
    et al.
    Nilsson, Anders N
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Taxonomic revision of Afrotropical Laccophilus Leach, 1815 (Coleoptera, Dytiscidae).2015Ingår i: ZooKeys, ISSN 1313-2989, E-ISSN 1313-2970, nr 542, s. 1-379Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The African species of the genus Laccophilus Leach, 1815, are revised, on the basis of study of adult specimens. In all, 105 species are now recognized. A phenetic character-analysis was undertaken, which resulted in a split of the genus into 17 species groups. Diagnoses and a description of each species are given together with keys for identification of species groups and species. We also provide habitus photos, illustration of male genitalia and distribution maps for all species. New species are described as follows: Laccophilus grossus sp. n. (Angola, Namibia), Laccophilus rocchii sp. n. (Tanzania, Namibia, Botswana, Mozambique), Laccophilus ferrugo sp. n. (Mozambique), Laccophilus furthi sp. n. (Madagascar), Laccophilus isamberti sp. n. (Madagascar), Laccophilus inobservatus sp. n. (Gambia, Senegal, Mali, Niger, Sudan, Chad, Ethiopia, Burkina Faso, Ivory Coast, Ghana, Nigeria, Cameroon, Zaire and Asia: Yemen), Laccophilus cryptos sp. n. (Zaire, Mozambique, Zimbabwe, Namibia, Botswana, South Africa), Laccophilus enigmaticus sp. n. (Nigeria, Sudan), Laccophilus bellus sp. n. (Benin, Nigeria), Laccophilus guentheri sp. n. (Guinea, Ghana), Laccophilus guineensis sp. n. (Guinea), Laccophilus decorosus sp. n. (Uganda), Laccophilus empheres sp. n. (Kenya), Laccophilus inconstans sp. n. (Guinea, Ivory Coast, Ghana, Nigeria, Cameroon), Laccophilus brancuccii sp. n. (Central African Republic), Laccophilus incomptus sp. n. (Cameroon), Laccophilus australis sp. n. (Tanzania, South Africa), Laccophilus minimus sp. n. (Namibia), Laccophilus eboris sp. n. (Ivory Coast), Laccophilus insularum sp. n. (Madagascar), Laccophilus occidentalis sp. n. (Gambia, Senegal, Mali, Guinea, Sierra Leone, Ivory Coast, Ghana, Benin, Nigeria, Central African Republic, Zaire) and Laccophilus transversovittatus sp. n. (Madagascar). Laccophilus restrictus Sharp, 1882, is restored as good species; not junior synonym of Laccophilus pictipennis Sharp, 1882. New synonyms are established as follows: Laccophilus continentalis Gschwendtner, 1935 = Laccophilus perplexus Omer-Cooper, 1970, syn. n., Laccophilus taeniolatus Régimbart, 1889 = Laccophilus congener Omer-Cooper, 1957, syn. n., Laccophilus adspersus Boheman, 1848 = Laccophilus vitshumbii Guignot, 1959, syn. n. = Laccophilus adspersus nigeriensis Omer-Cooper, 1970, syn. n. = Laccophilus adspersus sudanensis Omer-Cooper, 1970, syn. n., Laccophilus modestus Régimbart, 1895 = Laccophilus espanyoli Hernando, 1990, syn. n., Laccophilus flaveolus Régimbart, 1906 = Laccophilus pampinatus Guignot, 1941, syn. n., Laccophilus trilineola Régimbart, 1889 = Laccophilus simulator Omer-Cooper, 1958, syn. n., Laccophilus mediocris Guignot, 1952 = Laccophilus meii Rocchi, 2000, syn. n., Laccophilus epinephes Guignot, 1955 = Laccophilus castaneus Guignot, 1956, syn. n., Laccophilus saegeri Guignot, 1958 = Laccophilus comoensis Pederzani & Reintjes, 2002, syn. n., Laccophilus restrictus Sharp, 1882 = Laccophilus evanescens Régimbart, 1895, syn. n., Laccophilus incrassatus Gschwendtner, 1933 = Laccophilus virgatus Guignot, 1953, syn. n., Laccophilus cyclopis Sharp, 1882 = Laccophilus shephardi Omer-Cooper, 1965, syn. n., Laccophilus burgeoni Gschwendtner, 1930 = Laccophilus wittei Guignot, 1952, syn. n., Laccophilus secundus Régimbart, 1895 = Laccophilus torquatus Guignot, 1956, syn. n., Laccophilus desintegratus Régimbart, 1895 = Laccophilus sanguinosus Régimbart, 1895, syn. n. and Laccophilus flavopictus Régimbart, 1889 = Laccophilus bergeri Guignot, 1953, syn. n. = Laccophilus segmentatus Omer-Cooper, 1957, syn. n. Lectotypes are designated for the following taxa: Laccophilus productus Régimbart, 1906, Laccophilus ruficollis Zimmermann, 1919, Laccophilus sordidus Sharp, 1882, Laccophilus alluaudi Régimbart, 1899, Laccophilus pictipennis Sharp, 1882, Laccophilus wehnckei Sharp, 1882, Laccophilus continentalis Gschwendtner, 1935, Laccophilus simplicistriatus Gschwendtner, 1932, Laccophilus complicatus Sharp, 1882, Laccophilus rivulosus Klug, 1833, Laccophilus ampliatus Régimbart, 1895, Laccophilus pilitarsis Régimbart, 1906, Laccophilus adspersus Boheman, 1848, Laccophilus livens Régimbart, 1895, Laccophilus modestus Régimbart, 1895, Laccophilus nodieri Régimbart, 1895, Laccophilus flaveolus Régimbart, 1906, Laccophilus pallescens Régimbart, 1903, Laccophilus restrictus Sharp, 1882, Laccophilus vermiculosus Gerstaecker, 1867, Laccophilus mocquerysi Régimbart, 1895, Laccophilus bizonatus Régimbart, 1895, Laccophilus tschoffeni Régimbart, 1895, Laccophilus persimilis Régimbart, 1895, Laccophilus poecilus Klug, 1834, Laccophilus lateralis Sharp, 1882, Laccophilus lateralis var. polygrammus Régimbart, 1903, Laccophilus cyclopis Sharp, 1882, Laccophilus shephardi Omer-Cooper, 1965, Laccophilus conjunctus Guignot, 1950, Laccophilus grammicus Sharp, 1882, Laccophilus flavoscriptus Régimbart, 1895, Laccophilus flavosignatus Régimbart, 1895, Laccophilus brevicollis Sharp, 1882, Laccophilus secundus Régimbart, Laccophilus desintegratus Régimbart, 1895, Laccophilus gutticollis Régimbart, 1895, Laccophilus luctuosus Sharp, 1882 and Laccophilus inornatus Zimmermann, 1926. Laccophilus remex Guignot, 1952, comprises a species complex with uncertain taxonomic delimitation; the complex includes Laccophilus concisus Guignot, 1953, Laccophilus turneri Omer-Cooper, 1957 and Laccophilus praeteritus Omer-Cooper, 1957, as tentative synonyms of Laccophilus remex Guignot, 1952.

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  • 22. Bjelke, Ulf
    et al.
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Vattenytans mästare2018Ingår i: Yrfän, Vol. 2018, nr 3, s. 9-13Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 23. Blicharska, Malgorzata
    et al.
    Andersson, Johan
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Bjelke, Ulf
    Swedish Biodiversity Centre.
    Hilding-Rydevik, Tuija
    Johansson, Frank
    Uppsala University.
    Effects of management intensity, function and vegetation on the biodiversity in urban ponds2016Ingår i: Urban Forestry & Urban Greening, ISSN 1618-8667, E-ISSN 1610-8167, Vol. 20, s. 103-112Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Ponds are important elements of green areas in cities that help counteract the negative consequences of urbanization, by providing important habitats for biodiversity in cities and being essential nodes in the overall landscape-scale habitat network. However, there is relatively little knowledge about the impacts of pond management intensity, function and environmental variables on urban pond biodiversity. In this study we addressed this gap by investigating which factors were correlated with the level of biodiversity in urban ponds, indicated by species richness of aquatic insects, in Stockholm, Sweden. Our study did not confirm any direct link between the perceived intensity of management or function of ponds and overall biodiversity. However, it seems that management can influence particular groups of species indirectly, since we found that Trichoptera richness (Caddisflies) was highest at intermediate management intensity. We suggest that this is caused by management of vegetation, as the amount of floating and emergent vegetation was significantly correlated with both the overall species richness and the richness of Trichoptera (Caddisflies). This relationship was non-linear, since ponds with an intermediate coverage of vegetation had the highest richness. Interestingly, the amount of vegetation in the pond was significantly affected by pond function and pond management. The overall species richness and richness of Trichoptera were also positively correlated with pond size. Since we found that the pattern of relations between species richness and environmental variables differed between the insect groups we suggest that it will be difficult to provide overall design and management recommendations for ponds in urban green areas. Therefore, it is recommended that to provide high aquatic diversity of species in urban areas one should aim at promoting high diversity of different types of ponds with differing management and environmental factors that shape them.

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  • 24. Blicharska, Malgorzata
    et al.
    Andersson, Johan
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Bjelke, Ulf
    Hilding-Rydevik, Tuija
    Thomsson, Michaela
    Östh, John
    Johansson, Frank
    Uppsala University.
    Is there a relationship between socio-economic factors and biodiversity in urban ponds? A study in the city of Stockholm2017Ingår i: Urban Ecosystems, ISSN 1083-8155, E-ISSN 1573-1642, s. 1-12Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Urban small water bodies, such as ponds, are essential elements of human socio-economic landscapes. Ponds also provide important habitats for species that would otherwise not survive in the urban environment. Knowledge on the biodiversity of urban ponds and the relationship between their ecological value and factors linked to urbanization and socio-economic status is crucial for decisions on where and how to establish and manage ponds in cities to deliver maximum biodiversity benefits. Our study investigates if the pattern of urban-pond biodiversity can be related to different socio-economic factors, such as level of wealth, education or percentage of buildings of different types. Because of lack of previous studies investigating that, our study is of exploratory character and many different variables are used.We found that the biodiversity of aquatic insects was significantly negatively associated with urbanisation variables such as amount of buildings and number of residents living around ponds. This relationship did not differ depending on the spatial scale of our investigation. In contrast, we did not find a significant relationship with variables representing socio-economic status, such as education level and wealth of people. This latter result suggests that the socio-economic status of residents does not lead to any particular effect in terms of the management and function of ponds that would affect biodiversity. However, there is a need for a finer-scale investigation of the different potential mechanism in which residents in areas with differing socio-economic status could indirectly influence ponds.

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  • 25.
    Bukontaite, Rasa
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi. Stockholm University.
    Miller, Kelly
    University of New Mexico.
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    The utility of CAD in recovering Gondwanan vicariance events and the evolutionary history of Aciliini (Coleoptera: Dytiscidae).2014Ingår i: BMC Evolutionary Biology, E-ISSN 1471-2148, Vol. 14, nr 5, s. 1-18Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Background

    Aciliini presently includes 69 species of medium-sized water beetles distributed on all continents except Antarctica. The pattern of distribution with several genera confined to different continents of the Southern Hemisphere raises the yet untested hypothesis of a Gondwana vicariance origin. The monophyly of Aciliini has been questioned with regard to Eretini, and there are competing hypotheses about the intergeneric relationship in the tribe. This study is the first comprehensive phylogenetic analysis focused on the tribe Aciliini and it is based on eight gene fragments. The aims of the present study are: 1) to test the monophyly of Aciliini and clarify the position of the tribe Eretini and to resolve the relationship among genera within Aciliini, 2) to calibrate the divergence times within Aciliini and test different biogeographical scenarios, and 3) to evaluate the utility of the gene CAD for phylogenetic analysis in Dytiscidae.

    Results

    Our analyses confirm monophyly of Aciliini with Eretini as its sister group. Each of six genera which have multiple species are also supported as monophyletic. The origin of the tribe is firmly based in the Southern Hemisphere with the arrangement of Neotropical and Afrotropical taxa as the most basal clades suggesting a Gondwana vicariance origin. However, the uncertainty as to whether a fossil can be used as a stem-or crowngroup calibration point for Acilius influenced the result: as crowngroup calibration, the 95% HPD interval for the basal nodes included the geological age estimate for the Gondwana break-up, but as a stem group calibration the basal nodes were too young. Our study suggests CAD to be the most informative marker between 15 and 50 Ma. Notably, the 2000 bp CAD fragment analyzed alone fully resolved the tree with high support.

    Conclusions

    1) Molecular data confirmed Aciliini as a monophyletic group. 2) Bayesian optimizations of the biogeographical history are consistent with an influence of Gondwana break-up history, but were dependent on the calibration method. 3) The evaluation using a method of phylogenetic signal per base pair indicated Wnt and CAD as the most informative of our sampled genes.

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  • 26.
    Désamorè, Aurélie
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Laenen, Benjamin
    Miller, Kelly
    University of New Mexico.
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Early burst in body size evolution is uncoupled from species diversification in diving beetles (Dytiscidae)2018Ingår i: Molecular Ecology, ISSN 0962-1083, E-ISSN 1365-294X, Vol. 27, nr 4, s. 979-993Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Changes in morphology are often thought to be linked to changes in species diversification,

    which is expected to leave a signal of early burst (EB) in phenotypic traits.

    However, such signal is rarely recovered in empirical phylogenies, even for groups

    with well-known adaptive radiation. Using a comprehensive phylogenetic approach

    in Dytiscidae, which harbours ~4,300 species with as much as 50-fold variation in

    body size among them, we ask whether pattern of species diversification correlates

    with morphological evolution. Additionally, we test whether the large variation in

    body size is linked to habitat preference and whether the latter influences species

    turnover. We found, in sharp contrast to most animal groups, that Dytiscidae body

    size evolution follows an early-burst model with subsequent high phylogenetic conservatism.

    However, we found no evidence for associated shifts in species diversification,

    which point to an uncoupled evolution of morphology and species

    diversification. We recovered the ancestral habitat of Dytiscidae as lentic (standing

    water), with many transitions to lotic habitat (running water) that are concomitant

    to a decrease in body size. Finally, we found no evidence for difference in net diversification

    rates between habitats nor difference in turnover in lentic and lotic species.

    This result, together with recent findings in dragonflies, contrasts with some

    theoretical expectations of the habitat stability hypothesis. Thus, a thorough

    reassessment of the impact of dispersal, gene flow and range size on the speciation

    process is needed to fully encompass the evolutionary consequences of the lentic–

    lotic divide for freshwater fauna.

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  • 27. Elmqvist, H.
    et al.
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Myrlejonsländor2023Ingår i: Yrfän, Vol. 2, s. 10-12Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 28. Elmqvist, Håkan
    et al.
    Nyström, Dennis
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Aiolopus thalassinus (Fabricius, 1781), en nygräshoppa för Norden och en migrerande svärm som korsade Östersjön2020Ingår i: Entomologisk Tidskrift, ISSN 0013-886X, Vol. 141, nr 4, s. 161-171Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We report the first finding of the grasshopper Aiolopus thalassinus (Fabricius, 1781) inthe Nordic countries. Two migrating individuals were attracted to light at a known hotspotof migrating moths near the southernmost tip of Gotland in the Baltic Sea, 8th of August2020. End of September hundreds of individuals had made landfall in a bay not far from thefirst locality. The mass occurrence followed after days of easterly or southeasterly winds,a strengthened high pressure over Russia, and an early morning with low-lying clouds.Aiolopus thalassinus is a long-winged grasshopper with strong flight capacity and a widedistribution across the Old World. It also shares some of the density-dependent behavioraland physiological characteristics of the migratory locusts. In Europe the northern continuousdistribution limit stretches through south Germany and middle Poland. The findings onGotland follow the first record in Lithuania, 2019, and a recent trend of expanding rangein south Germany which indicates a species expanding its distribution due to a changingclimate. The findings also show that this is a species capable of swarm migration and crossinga minimum of 170 km of open sea when winds are favorable.

  • 29. Englund, William
    et al.
    Njoroge, Laban
    Biström, Olof
    Miller, Kelly
    University of New Mexico.
    Bilton, David
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Taxonomic revision of the Afrotropical Agabus raffrayi species group with the description of four new species (Coleoptera, Dytiscidae)2020Ingår i: ZooKeys, ISSN 1313-2989, E-ISSN 1313-2970, Vol. 963, s. 45-79Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We revise the Afrotropical Agabus raffrayi species group, motivated by the discovery of new diversity in Kenya and South Africa. Whilst Agabus is mainly a holarctic genus, the Agabus raffrayi group is restricted to high altitude regions of eastern Africa and temperate parts of South Africa, from where we describe the southernmost Agabus in the world. The following new species are introduced: Agabus anguluverpus sp. nov. from Mount Kenya in central Kenya, Agabus austellus sp. nov. a widespread species in South Africa, Agabus riberae sp. nov. from the Kamiesberg and northeastern Cederberg ranges in the Northern and Western Cape Provinces of South Africa and Agabus agulhas sp. nov. from the Agulhas Plain, Western Cape Province, South Africa. We provide a distribution map, a determination key for males, quantitative measurements of diagnostic characters, habitus photos and detailed photos of male genitalia for all described species in the group, as well as images of diagnostic characters and habitats. The presence or absence of an elongated section between the subapical broadening and the base of the apical and subapical teeth of the male aedeagus is a useful novel character, first revealed by our study. In contrast with the most recent revision of Afrotropical Agabus, we show that Agabus ruwenzoricus Guignot, 1936 is restricted to eastern Africa; South African records of this species having been based on misidentifications, no species of the group being common to southern and eastern Africa. We speculate that the raffrayi group may display phylogenetic niche conservatism, being restricted, as an originally temperate taxon, to higher elevations in tropical eastern Africa, but occurring at lower altitudes in temperate South Africa.

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  • 30. Fossen, Erlend I
    et al.
    Ekrem, Torbjørn
    Nilsson, Anders N
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Species delimitation in northern European water scavenger beetles of the genus Hydrobius (Coleoptera, Hydrophilidae).2016Ingår i: ZooKeys, ISSN 1313-2989, E-ISSN 1313-2970, nr 564Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The chiefly Holarctic Hydrobius species complex (Coleoptera, Hydrophilidae) currently consists of Hydrobius arcticus Kuwert, 1890, and three morphological variants of Hydrobius fuscipes (Linnaeus, 1758): var. fuscipes, var. rottenbergii and var. subrotundus in northern Europe. Here molecular and morphological data are used to test the species boundaries in this species complex. Three gene segments (COI, H3 and ITS2) were sequenced and analyzed with Bayesian methods to infer phylogenetic relationships. The Generalized Mixed Yule Coalescent (GMYC) model and two versions of the Bayesian species delimitation method BPP, with or without an a priori defined guide tree (v2.2 & v3.0), were used to evaluate species limits. External and male genital characters of primarily Fennoscandian specimens were measured and statistically analyzed to test for significant differences in quantitative morphological characters. The four morphotypes formed separate genetic clusters on gene trees and were delimited as separate species by GMYC and by both versions of BPP, despite specimens of Hydrobius fuscipes var. fuscipes and Hydrobius fuscipes var. subrotundus being sympatric. Hydrobius arcticus and Hydrobius fuscipes var. rottenbergii could only be separated genetically with ITS2, and were delimited statistically with GMYC on ITS2 and with BPP on the combined data. In addition, six or seven potentially cryptic species of the Hydrobius fuscipes complex from regions outside northern Europe were delimited genetically. Although some overlap was found, the mean values of six male genital characters were significantly different between the morphotypes (p < 0.001). Morphological characters previously presumed to be diagnostic were less reliable to separate Hydrobius fuscipes var. fuscipes from Hydrobius fuscipes var. subrotundus, but characters in the literature for Hydrobius arcticus and Hydrobius fuscipes var. rottenbergii were diagnostic. Overall, morphological and molecular evidence strongly suggest that Hydrobius arcticus and the three morphological variants of Hydrobius fuscipes are separate species and Hydrobius rottenbergii Gerhardt, 1872, stat. n. and Hydrobius subrotundus Stephens, 1829, stat. n. are elevated to valid species. An identification key to northern European species of Hydrobius is provided.

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  • 31. Gaytan, Alvaro
    et al.
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Canelo, Tara
    Pérez‐Izquierdo, Carlos
    Santoro, Maria
    Bonal, Raul
    DNA Barcoding and geographical scale effect: The problems of undersampling genetic diversity hotspots2020Ingår i: Ecology and Evolution, E-ISSN 2045-7758, Vol. 10, s. 10754-10772Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    DNA barcoding identification needs a good characterization of intraspecific genetic divergence to establish the limits between species. Yet, the number of barcodes per species is many times low and geographically restricted. A poor coverage of the species distribution range may hamper identification, especially when undersampled areas host genetically distinct lineages. If so, the genetic distance between some query sequences and reference barcodes may exceed the maximum intraspecific threshold for unequivocal species assignation. Taking a group of Quercus herbivores (moths) in Europe as model system, we found that the number of DNA barcodes from southern Europe is proportionally very low in the Barcoding of Life Data Systems. This geographical bias complicates the identification of southern query sequences, due to their high intraspecific genetic distance with respect to barcodes from higher latitudes. Pairwise intraspecific genetic divergence increased along with spatial distance, but was higher when at least one of the sampling sites was in southern Europe. Accordingly, GMYC (General Mixed Yule Coalescent) single-threshold model retrieved clusters constituted exclusively by Iberian haplotypes, some of which could correspond to cryptic species. The number of putative species retrieved was more reliable than that of multiple-threshold GMYC but very similar to results from ABGD and jMOTU. Our results support GMYC as a key resource for species delimitation within poorly inventoried biogeographic regions in Europe, where historical factors (e.g., glaciations) have promoted genetic diversity and singularity. Future European DNA barcoding initiatives should be preferentially performed along latitudinal gradients, with special focus on southern peninsulas. 

  • 32. Gustafson, Grey
    et al.
    Ranarilalatiana, Tolotra
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Coleoptera: Gyrinidae, whirligig beetles, fandiorano2022Ingår i: The new natural history of Madagascar / [ed] Steven M. Goodman, Princeton: Princeton University Press, 2022, 1, s. 1034-1041Kapitel i bok, del av antologi (Övrigt vetenskapligt)
  • 33. Gustafson, Grey T.
    et al.
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Randriamihaja, Jacquelin Herisahala
    Miller, Kelly
    University of New Mexico.
    The morphology and behavior of the endemic Malagasy whirligig beetle Heterogyrus milloti Legros, 1953 (Coleoptera: Gyrinidae: Heterogyrinae)2017Ingår i: The Coleopterists bulletin, ISSN 0010-065X, E-ISSN 1938-4394, Vol. 71, nr 2, s. 315-328Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The Malagasy endemic whirligig beetle Heterogyrus milloti Legros, 1953 is redescribed. Jumping behavior of H. milloti is reported here for the first time with video recordings provided. Results of a behavioral experiment conducted in the field demonstrate H. milloti jumps in a targeted manner in a downstream direction. The unique habitat of H. milloti is described in detail with both image and video of the habitat included. Morphology of H. milloti is discussed in detail, revealing symplesiomorphies with Spanglerogyrus Folkerts, 1979, characters forming transitional series between Spanglerogyrus and the Gyrininae, and features unique to H. milloti. The potential adaptive significance of these peculiar morphological features in association with the habitat of H. milloti is discussed. Finally, an argument for the necessity of conservation of this species is made, and common names in English, French, Malagasy, and Swedish for H. milloti are proposed to aid conservation efforts.

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  • 34. Gustafson, Grey T.
    et al.
    Prokin, Alexander A.
    Bukontaite, Rasa
    Naturhistoriska riksmuseet, Enheten för zoologi. Stockholm University.
    Miller, Kelly
    University of New Mexico.
    Tip-dated phylogeny of whirligig beetles reveals ancient lineage surviving on Madagascar2017Ingår i: Scientific Reports, E-ISSN 2045-2322, Vol. 7, s. 1-9, artikel-id 8619Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The temporal origin of Madagascar’s extraordinary endemic diversity is debated. A preference for Cenozoic dispersal origins has replaced the classical view of Mesozoic vicariance in the wake of molecular dating. However, evidence of ancient origins is mounting from arthropod groups. Using phylogenetic ‘tip-dating’ analysis with fossils, we show that a whirligig beetle species, Heterogyrus milloti, inhabiting forest streams in southeastern Madagascar is the last survivor of a once dominant and widespread Mesozoic group. With a Late Triassic to Early Jurassic origin (226–187 Ma) it is the hitherto oldest dated endemic lineage of animal or plant on Madagascar. Island biotas’ sensitivity to extinction is well known, but islands can also provide refuge from continental extinction. Heterogyrus milloti is an irreplaceable link to the freshwater biota of the Mesozoic and serves as a reminder of what may be lost without critical conservation e orts on Madagascar. 

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  • 35. Heino, Jani
    et al.
    Bini, Luis M
    Andersson, Johan
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Bjelke, Ulf
    Swedish Biodiversity Centre.
    Johansson, Frank
    Uppsala University.
    Unravelling the correlates of species richness and ecological uniqueness in a metacommunity of urban pond insects2016Ingår i: Ecological Indicators, ISSN 1470-160X, E-ISSN 1872-7034, Vol. 73, s. 422-431Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    City ponds have the potential to harbour a rich biodiversity of aquatic insects despite being located in an urban landscape. However, our current knowledge on the correlates of pond biodiversity is limited and even less is known about the factors that influence the ecological uniqueness of urban ponds. The multiple environmental gradients, at different spatial scales, that may affect biodiversity and ecological uniqueness of urban ponds can thus be seen both as an opportunity and as a challenge for a study. In this study, we aimed to fill this gap by focusing on aquatic insect assemblages in 51 ponds in the Swedish city of Stockholm, using a metacommunity perspective. We found that species richness was primarily determined by the density of aquatic insects, water depth and proportion of buildings around the pond. The uniqueness of ponds was estimated as local contributions to beta diversity (LCBD), and it was primarily related to the proportion of arable land and industry around the ponds. With regard to the metacommunity we found two interesting patterns. First, there was a negative relationship between richness and LCBD. Second, biodiversity was spatially independent, suggesting that spatially-patterned dispersal did not structure species richness or LCBD. These last two patterns are important when considering conservation efforts of biodiversity in city ponds. We hence suggest that the conservation of insect biodiversity in urban pond should consider the surroundings of the ponds, and that high-richness ponds are not necessarily those that require most attention because they are not ecologically the most unique.

  • 36.
    Hjalmarsson, Anna
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Monaghan, Michael
    Dispersal is linked to habitat use in 59 species of water beetles (Coleoptera: Adephaga) on Madagascar2014Ingår i: Ecography, ISSN 0906-7590, E-ISSN 1600-0587, Vol. 37, s. 001-008Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Lentic habitats (standing water, such as ponds and lakes) differ from lotic habitats (running water; streams and rivers) in their spatiotemporal persistence, with lentic habitats being more ephemeral in evolutionary time. This habitat instability is thought to select for dispersal, and several phylogenetic and macroecological studies have suggested that high rates of dispersal are more characteristic of lentic than lotic species. We tested this hypothesis using a comparative population genetic and phylogeographic approach based on mitochondrial DNA for 59 aquatic beetle species, sampled across Madagascar. Species were classified as lotic (n = 25), lentic (n = 25), or lotolentic (associated with both running and standing water; n = 9). Hierarchical population genetic structure (AMOVA), nucleotide diversity (π), and geographic structure were compared among habitat types. Lotic species had significantly greater population structure (ФST = 0.55, hierarchical AMOVA) than lentic (ФST = 0.13) and lotolentic (ФST = 0.19) species using phylogenetic generalized least squares (PGLS) to correct for phylogeny. Body size was independent of habitat preference, and did not explain any of the intraspecific variation. A greater proportion of lotic species were endemic to Madagascar and lotic species had more pronounced geographic structure in their haplotype networks. The results indicate that dispersal is consistently lower among lotic species, independent of phylogenetic relatedness. This has macroevolutionary and biogeographical consequences for the freshwater fauna of this tropical biodiversity hotspot where remaining natural habitats are becoming increasingly isolated from one another.

  • 37. Holmgren, Sandra
    et al.
    Angus, Robert
    Jia, Fenglong
    Chen, Zhen-Ning
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Resolving the taxonomic conundrum in Graphoderus of the east Palearctic with a key to all species (Coleoptera, Dytiscidae).2016Ingår i: ZooKeys, ISSN 1313-2989, E-ISSN 1313-2970, nr 574, s. 113-142Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The Holarctic diving beetle genus Graphoderus (Dytiscinae, Aciliini) contains relatively few and well-known species but these may still be difficult to identify based on external characters. A taxonomic problem in the eastern Palearctic was discovered that relates to the Palearctic Graphoderus zonatus (Hoppe, 1795) and the Nearctic Graphoderus perplexus Sharp, 1882. Based on qualitative and quantitative characters, especially on male genitalia which have been poorly studied in the past, it is shown that eastern Palearctic specimens identified by previous authors as either of the two species in fact belongs to a third species. The synonymized name Graphoderus elatus Sharp, 1882, is reinstated as a valid species (stat. n.) and a lectotype is designated from the mixed syntype series. The male genitalia of all known Graphoderus species have been examined and an illustrated identification key to the genus is provided. The three species in the complex of focus, Graphoderus elatus, Graphoderus zonatus and Graphoderus perplexus are found to have allopatric distributions; Graphoderus perplexus in the Nearctic region, Graphoderus zonatus in the west Palearctic region and eastwards to the Yenisei-Angara river and Graphoderus elatus east of the Yenisei-Angara river. All previous records of either Graphoderus zonatus or Graphoderus perplexus in the east Palearctic, east of the Yenisei-Angara river turned out to be misidentified Graphoderus elatus. This conclusion also brings with it that dimorphic females, thought only to be present in the single subspecies Graphoderus zonatus verrucifer (CR Sahlberg, 1824), proved to be present also in a second species, Graphoderus elatus. The dimorphic female forms is either with dorsally smooth elytra and pronotum or conspicuously granulated elytra and wrinkly pronotum. As has been shown in Graphoderus zonatus verrucifer there is a correlation between the occurrence of granulate female forms in a population and an increase in the number of adhesive discs on pro- and mesotarsus in males within Graphoderus elatus.

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  • 38. Houshuai, Wang
    et al.
    Wahlberg, Niklas
    Holloway, Jeremy D
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Fan, Xiaoling
    Janzen, Daniel H
    Hallwachs, Winnie
    Wen, Lijun
    Wang, Min
    Nylin, Sören
    Stockholm University.
    Molecular phylogeny of Lymantriinae (Lepidoptera, Noctuoidea, Erebidae) inferred from eight gene regions2015Ingår i: Cladistics, ISSN 0748-3007, E-ISSN 1096-0031, Vol. 31, nr 6, s. 579-592Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    To understand the evolutionary history of Lymantriinae and test the present higher-level classification, we performed the first broad-scale molecular phylogenetic analysis of the subfamily, based on 154 exemplars representing all recognized tribes and drawn from all major biogeographical regions. We used two mitochondrial genes (cytochrome c oxidase subunit I and 16S ribosomal RNA) and six nuclear genes (elongation factor-1α, carbamoylphosphate synthase domain protein, ribosomal protein S5, cytosolic malate dehydrogenase, glyceraldehyde-3-phosphate dehydrogenase and wingless). Data matrices (in total 5424 bp) were analysed by parsimony and model-based evolutionary methods (maximum likelihood and Bayesian inference). Based on the results of the analyses, we present a new phylogenetic classification for Lymantriinae composed of seven well-supported tribes, two of which are proposed here as new: Arctornithini, Leucomini, Lymantriini, Orgyiini, Nygmiini, Daplasini trib. nov. and Locharnini trib. nov. We discuss the internal structure of each of these tribes and address some of the more complex problems with the genus-level classification, particularly within Orgyiini and Nygmiini.

  • 39. Iversen, Lars Lönnsman
    et al.
    Svensson, Erik I
    Christensen, Sören Thromsholdt
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Sand-Jensen, Kaj
    Sexual conflict and intrasexual polymorphism promote assortative mating and halt population differentiation2019Ingår i: Proceedings of the Royal Society of London. Biological Sciences, ISSN 0962-8452, E-ISSN 1471-2954, Vol. 286, s. 1-8Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Sexual conflict is thought to be an important evolutionary force in drivingphenotypic diversification, population divergence, and speciation. However,empirical evidence is inconsistent with the generality that sexual conflictenhances population divergence. Here, we demonstrate an alternativeevolutionary outcome in which sexual conflict plays a conservative role inmaintaining male and female polymorphisms locally, rather than promotingpopulation divergence. In diving beetles, female polymorphisms haveevolved in response to male mating harassment and sexual conflict. We presentthe first empirical evidence that this female polymorphism is associatedwith (i) two distinct and sympatric male morphological mating clusters(morphs) and (ii) assortative mating between male and female morphs.Changes in mating traits in one sex led to a predictable change in the othersex which leads to predictable within-population evolutionary dynamics inmale and female morph frequencies. Our results reveal that sexual conflictcan lead to assortative mating between male offence and female defencetraits, if a stable male and female mating polymorphisms are maintained.Stable male and female mating polymorphisms are an alternative outcometo an accelerating coevolutionary arms race driven by sexual conflict. Suchstable polymorphisms challenge the common view of sexual conflict as anengine of rapid speciation via exaggerated coevolution between sexes.

  • 40. Karlsson Green, Kristina
    et al.
    Svensson, Erik
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Härdling, Roger
    Hansson, Bengt
    The interplay between local ecology, divergent selection and genetic drift in population divergence of a sexually antagonistic female trait2014Ingår i: Evolution, ISSN 0014-3820, E-ISSN 1558-5646, Vol. 68, nr 7, s. 1934-1946Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Genetically polymorphic species offer the possibility to study maintenance of genetic variation and the potential role for genetic drift in population divergence. Indirect inference of the selection regimes operating on polymorphic traits can be achieved by comparing population divergence in neutral genetic markers with population divergence in trait frequencies. Such an approach could further be combined with ecological data to better understand agents of selection. Here, we infer the selective regimes acting on a polymorphic mating trait in an insect group; the dorsal structures (either rough or smooth) of female diving beetles. Our recent work suggests that the rough structures have a sexually antagonistic function in reducing male mating attempts. For two species (Dytiscus lapponicus andGraphoderus zonatus), we could not reject genetic drift as an explanation for population divergence in morph frequencies, whereas for the third (Hygrotus impressopunctatus) we found that divergent selection pulls morph frequencies apart across populations. Furthermore, population morph frequencies in H. impressopunctatus were significantly related to local bioclimatic factors, providing an additional line of evidence for local adaptation in this species. These data, therefore, suggest that local ecological factors and sexual conflict interact over larger spatial scales to shape population divergence in the polymorphism.

  • 41.
    Košuthová, Alica
    et al.
    Naturhistoriska riksmuseet, Enheten för botanik.
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Westberg, Martin
    Uppsala University, Sweden.
    Wedin, Mats
    Naturhistoriska riksmuseet, Enheten för botanik.
    Species delimitation in the cyanolichen genus Rostania2020Ingår i: BMC Evolutionary Biology, E-ISSN 1471-2148, Vol. 115Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Background

    In this study, we investigate species limits in the cyanobacterial lichen genus Rostania (Collemataceae, Peltigerales, Lecanoromycetes). Four molecular markers (mtSSU rDNA, β-tubulin, MCM7, RPB2) were sequenced and analysed with two coalescent-based species delimitation methods: the Generalized Mixed Yule Coalescent model (GMYC) and a Bayesian species delimitation method (BPP) using a multispecies coalescence model (MSC), the latter with or without an a priori defined guide tree.

    Results

    Species delimitation analyses indicate the presence of eight strongly supported candidate species. Conclusive correlation between morphological/ecological characters and genetic delimitation could be found for six of these. Of the two additional candidate species, one is represented by a single sterile specimen and the other currently lacks morphological or ecological supporting evidence.

    Conclusions

    We conclude that Rostania includes a minimum of six species: R. ceraniscaR. multipunctataR. occultata 1, R. occultata 2, R. occultata 3, and R. occultata 4,5,6. Three distinct Nostoc morphotypes occur in Rostania, and there is substantial correlation between these morphotypes and Rostania thallus morphology.

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  • 42.
    Lähteenaro, Meri
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi. Department of Zoology Swedish Museum of Natural History Stockholm Sweden;Department of Zoology, Faculty of Science Stockholm University Stockholm Sweden.
    Straka, Jakub
    Department of Zoology, Faculty of Science Charles University Prague Czech Republic.
    Forshage, Mattias
    Naturhistoriska riksmuseet, Enheten för zoologi. Department of Zoology Swedish Museum of Natural History Stockholm Sweden.
    Hovmöller, Rasmus
    Department of Zoology Swedish Museum of Natural History Stockholm Sweden;SLU Swedish Species Information Centre Uppsala Sweden.
    Nakase, Yuta
    Faculty of the Arts Kyoto University of the Arts Kyoto Japan.
    Nilsson, Anders L.
    Museum of Evolution, Uppsala University Uppsala Sweden.
    Smit, John T.
    Naturalis Biodiversity Center Leiden The Netherlands;European Invertebrate Survey Leiden The Netherlands.
    Nylander, Johan A A
    Naturhistoriska riksmuseet, Enheten för bioinformatik och genetik. NBIS.
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi. Department of Zoology Swedish Museum of Natural History Stockholm Sweden;Department of Zoology, Faculty of Science Stockholm University Stockholm Sweden.
    Phylogenomic species delimitation of the twisted‐winged parasite genus Stylops (Strepsiptera)2023Ingår i: Systematic Entomology, ISSN 0307-6970, E-ISSN 1365-3113Artikel i tidskrift (Refereegranskat)
  • 43. Michat, Mariano
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Larval description and chaetotaxic analysis of Dineutus sinuosipennis Laporte, 1840, with a key for the identification of larvae of the tribe Dineutini (Coleoptera, Gyrinidae).2017Ingår i: ZooKeys, ISSN 1313-2989, E-ISSN 1313-2970, Vol. 718, s. 95-114Artikel i tidskrift (Refereegranskat)
    Abstract [en]

     The larvae of the Malagasy whirligig beetle Dineutus sinuosipennis Laporte, 1840, identified using DNA sequence data, are described and illustrated for the first time, including detailed morphometric and chaetotaxic analyses of selected structures and a description of larval habitat. Larvae of the genus Dineutus Macleay, 1825 are diagnosed, and a key to identify the genera of the tribe Dineutini is presented. Larvae of Dineutus exhibit the characters traditionally recognized as autapomorphies of the Gyrinidae: body less sclerotized, egg bursters located on the parietal, one additional sensorial plate on the third antennomere, cardo and lacinia well developed, prementum completely divided, abdominal tracheal gills, and four terminal hooks on the pygopod. They also share with larvae of the other Dineutini genera these putative synapomorphies: numerous minute pore-like additional structures on the ultimate maxillary and labial palpomeres, coxal primary seta CO12 inserted submedially, and trochanteral primary seta TR2 absent. Larvae of Dineutus can be distinguished from those of other known genera of Dineutini by the posterior margin of the lacinia not dentate, tracheal gills plumose, parietal seta PA5 inserted relatively far from setae PA7–9, mandibular pores MNb and MNc inserted relatively far from each other, and tarsal seta TA1 inserted submedially.

  • 44.
    Miller, Kelly
    et al.
    University of New Mexico.
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Diving Beetles of the World - Systematics and Biology of the Dytiscidae.2016Bok (Övrigt vetenskapligt)
  • 45.
    Miller, Kelly
    et al.
    University of New Mexico.
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Predaceous Diving Beetle Sexual Systems2014Ingår i: Ecology, Systematics and the Natural History of Predaceous Diving Beetles (Coleoptera: Dytiscidae) / [ed] Donald A Yee, Springer, 2014, s. 199-233Kapitel i bok, del av antologi (Övrigt vetenskapligt)
    Abstract [en]

     Predaceous diving beetles have an impressively diverse array of

    morphological and behavioral attributes associated with sexual systems. These

    include anatomical dimorphisms with males and females exhibiting many secondary

    sexual features, behavioral dimorphisms in precopulatory and copulatory activities,

    extensive variation in male and female genitalia, and sperm complexity that includes

    sperm conjugation and heteromorphism. Many of these attributes appear to be

    correlated, suggesting emphasis by certain clades on particular sexual systems.

    For example, members of Dytiscinae appear to emphasize pre-insemination sexual

    selection with female resistance behavior possibly associated with the male ability

    to threaten suffocation of females during copulatory activities, which take place

    over many hours of mate guarding. In this case, males have large adhesive discs

    on their protarsi used to better subdue a resistant female, whereas females have

    modified pronotal and elytral cuticle that interfere with male adhesive discs.

    This group also has among the simplest male sperm and female reproductive tract 

     morphology, suggesting more limited post-insemination selection, but strong

    pre-insemination sexual antagonism. In contrast, members of Hydroporinae

    have no obvious pre- insemination mating behaviors and only short mating

    durations. This group also has dramatically complex female reproductive tracts

    and male sperm morphology including conjugation and heteromorphism suggesting

    intensity in post- insemination sperm choice, sperm cooperation, and sperm competition.

    Here, dytiscid sexual attributes are reviewed along with discussion of dytiscid

    sexual system evolution.

  • 46.
    Miller, Kelly
    et al.
    University of New Mexico.
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Predaceous diving beetle sexual systems2023Ingår i: Ecology, systematics and the natural history of predaceous diving beetles (Coleoptera. Dytiscidae) / [ed] Donald A. Yee, Springer, 2023, 2, s. 187-224-Kapitel i bok, del av antologi (Refereegranskat)
  • 47.
    Miller, Kelly
    et al.
    University of New Mexico.
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    The phylogeny and classification of predaceous diving beetles.2014Ingår i: Ecology, Systematics and the Natural History of Predaceous Diving Beetles (Coleoptera: Dytiscidae) / [ed] Donald A Yee, Springer, 2014, s. 49-172Kapitel i bok, del av antologi (Refereegranskat)
    Abstract [en]

     The phylogenetics and higher (family-group) classifi cation of extant

    members of the beetle family Dytiscidae (Coleoptera), or predaceous diving beetles,

    is reviewed and reassessed. A phylogenetic analysis of the family is presented based

    on 168 species of diving beetles and 9 outgroup taxa from Gyrinidae, Noteridae,

    Amphizoidae and Paelobiidae. All currently recognized dytiscid subfamilies and

    tribes are represented, most by multiple genera and species. Data include 104 morphological

    characters and approximately 6,700 aligned bases from 9 DNA sequence

    fragments from cytochrome c oxidase I  (COI) and II  (COII), histone III  (H3), 16S

    rRNA  (16S), 12S rRNA  (12S), arginine kinase  (argkin), RNA polymerase II  (RNA

    pol II), elongation factor 1 alpha  (Ef1α ), and wingless  (wnt). Parsimony and

    Bayesian analyses were conducted. The topology of the parsimony tree (consensus

    of 13 equally parsimonious solutions) exhibits numerous anomalies inconsistent

    with convincing morphological features and the Bayesian results and has,

    generally, relatively poor bootstrap support for major clades. The Bayesian topology

    is more consistent with major morphological features and has strong support 

     for most clades, and conclusions are based primarily on this estimate. Major

    higher-level phylogenetic relationships with strong support include: (1) monophyly

    of Dytiscidae Leach, (2) Matinae Branden sister to the rest of Dytiscidae,

    (3) Agabinae Thomson + Colymbetinae Erichson, (4) Hydrodytinae

    Miller + Hydroporinae Aubé, (5) Dytiscinae Leach + Laccophilinae Gistel +

    Cybistrini Sharp + Copelatinae Branden, (6) monophyly of the subfamilies Matinae,

    Colymbetinae, Copelatinae, Coptotominae Branden, Lancetinae Branden,

    Laccophilinae (including Agabetes  Crotch), Agabinae (support weaker than in other

    subfamilies) and Hydroporinae (monophyly of Hydrodytinae not tested), (7) paraphyly

    of Dytiscinae with Cybistrini sister to Laccophilinae (with strong support)

    and this clade sister to other Dytiscinae, and (8) monophyly of both Agabini

    ( Agabus  -group of genera) and Hydrotrupini Roughley ( Hydrotrupes  Sharp and the

    Platynectes  -group of genera). Major conclusions regarding tribes within

    Hydroporinae include: (1) monophyly of the tribes Vatellini Sharp, Methlini

    Branden, Hydrovatini Sharp, Hygrotini Portevin, Hyphydrini Gistel (without

    Pachydrus  Sharp) and Bidessini Sharp (including Peschetius  Guignot, Hydrodessus

     J. Balfour-Browne and Amarodytes  Régimbart) (monophyly of Laccornini

    Wolfe and Roughley and Pachydrini Biström, Nilsson and Wewalka not tested),

    (2) Pachydrini is a problematic, long-branched taxa resolved here as sister to

    Hydrovatini but with weak support, (3) Hydroporini monophyletic except for

    Laccornellus  Roughley and Wolfe and Canthyporus  Zimmermann, (4) Laccornellus

     and Canthyporus  together monophyletic and sister to Hydroporinae except

    Laccornini. Four groups are resolved within Hydroporini exclusive of

    Laccornellus  + Canthyporus  corresponding to the Deronectes  -, the Graptodytes  -,

    the Necterosoma  - and the Hydroporus  -groups of genera. The classifi cation of

    Dytiscidae is revised with the following taxonomic changes: (1) Hydrotrupini is

    recognized as a tribe of Agabinae including the genus Hydrotrupes  and the

    Platynectes  -group of genera ( new status  ), (2) the genus Rugosus  García is moved

    from Colymbetinae to Copelatinae ( new placement  ), (3) Cybistrini is elevated

    from tribe rank within Dytiscinae to subfamily of Dytiscidae ( new rank  ), (4)

    Hyderodini Miller is placed as a junior synonym of Dytiscini ( new synonymy  ), (5)

    Laccornellus  and Canthyporus  are removed from Hydroporini and placed in their

    own tribe, Laccornellini ( new tribe  ), (6) the following family group names are

    resurrected from synonymy with Hydroporini and placed as subtribes within

    Hydroporini, Deronectina Galewski (for the Deronectes  -group of genera, new

    status  ), Siettitiina Smrž (for the Graptodytes  -group of genera, new status  ),

    Sternopriscina Branden (for the Necterosoma  -group of genera, new status  ), and

    Hydroporina (for the Hydroporus  -group of genera, new status  ), (7) Carabhydrini

    Watts is placed as a junior synonym of Sternopriscina ( new synonymy  ), and

    (8) Hydrodessus  , formerly incerta sedis  with respect to tribe, is placed in Bidessini

    ( new placement  ). Each subfamily, tribe and subtribe is diagnosed and its taxonomic

    history discussed.

  • 48.
    Miller, Kelly
    et al.
    University of New Mexico.
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    The phylogeny and classification of predaceous diving beetles (Coleoptera: Dytiscidae)2023Ingår i: Ecology, systematics and the natural history of predaceous diving beetles (Coleoptera. Dytiscidae) / [ed] Donald A. Yee, Springer, 2023, 2, s. 55-185Kapitel i bok, del av antologi (Refereegranskat)
  • 49. Morinière, Jérôme
    et al.
    Michat, Mariano
    Jäch, Manfred
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Hendrich, Lars
    Balke, Michael
    Anisomeriini diving beetles – an Atlantic-Pacific Island disjunction on Tristan da Cunha and Robinson Crusoe Island, Juan Fernández?2015Ingår i: Cladistics, ISSN 0748-3007, E-ISSN 1096-0031Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Anisomeriini diving beetles contain only two enigmatic species, representing a remarkable disjunction between the Pacific Juan Fernández Islands (Anisomeria bistriata) and the South Atlantic Tristan da Cunha Archipelago (Senilites tristanicola). They belong to the Colymbetinae, which contain 140 species worldwide. Here we aim to reconstruct the evolutionary history of the Anisomerinii and use > 9000 bp DNA sequence data from 13 fragments of 12 loci for a comprehensive sampling of Colymbetinae species. Analyses under different optimization criteria converge on very similar topologies, and show unambiguously that Anisomeria bistriata andSenilites tristanicola belong to the Neotropical Rhantus signatus species group, a comparatively recent clade within Colymbetinae. Anisomeriini therefore are synonomized with Colymbetini and both species are transferred to Rhantus accordingly, resulting in secondary homonymy of Rhantus bistriatus (Brullé, 1835) with Rhantus bistriatus (Bergsträsser, 1778). We propose the replacement name Rhantus selkirki Jäch, Balke & Michat nom. nov. for the Juan Fernández species. Presence of these species on remote islands is therefore not relictary, but the result of more recent range expansions out of mainland South America. Finally, we suggest that Carabdytini should be synonymized with Colymbetini. Our study underpins the Hennigian principle that a natural classification can be derived only from the search for shared apomorphies between species, not from differences.

  • 50. Morinière, Jérôme
    et al.
    Van Dam, Matthew H
    Hawlitschek, Oliver
    Bergsten, Johannes
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Michat, Mariano C
    Hendrich, Lars
    Ribera, Ignacio
    Toussaint, Emmanuel F A
    Balke, Michael
    Phylogenetic niche conservatism explains an inverse latitudinal diversity gradient in freshwater arthropods.2016Ingår i: Scientific Reports, E-ISSN 2045-2322, Vol. 6, s. 1-12Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The underlying mechanisms responsible for the general increase in species richness from temperate regions to the tropics remain equivocal. Many hypotheses have been proposed to explain this astonishing pattern but additional empirical studies are needed to shed light on the drivers at work. Here we reconstruct the evolutionary history of the cosmopolitan diving beetle subfamily Colymbetinae, the majority of which are found in the Northern hemisphere, hence exhibiting an inversed latitudinal diversity gradient. We reconstructed a dated phylogeny using 12 genes, to investigate the biogeographical history and diversification dynamics in the Colymbetinae. We aimed to identify the role that phylogenetic niche conservatism plays in the inversed diversification pattern seen in this group. Our results suggest that Colymbetinae originated in temperate climates, which supports the hypothesis that their distribution is the result of an ancestral adaptation to temperate environmental conditions rather than tropical origins, and that temperate niche conservatism can generate and/or maintain inverse latitudinal diversity gradients.

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