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New species and new records of freshwater Chaetonotida (Gastrotricha) from Sweden
Swedish Museum of Natural History, Department of Zoology.
2011 (English)In: Zootaxa, ISSN 1175-5326, Vol. 3115, 29-55 p.Article in journal (Refereed) Published
Abstract [en]

Gastrotricha is a small phylum of acoelomatic aquatic invertebrates common in both marine and freshwater environments. The freshwater gastrotrich fauna of Sweden is poorly known and so far only 20 species have been reported. In this study two species, Heterolepidoderma joermungandri n. sp. and H. trapezoidum n. sp., are described as new to science. Moreover, 9 species are presented as new to the Swedish fauna. Additional taxonomic information is also given for 4 species previously reported from the country. In total 7 genera of two families, Chaetonotidae and Dasydytidae, are presented and the number of reported freshwater gastrotrichs from the country is increased to 31.

Place, publisher, year, edition, pages
Magnolia Press, 2011. Vol. 3115, 29-55 p.
Keyword [en]
Chaetonotidae, Dasydytidae, Freshwater fauna, taxonomy
National Category
Zoology
Research subject
Diversity of life
Identifiers
URN: urn:nbn:se:nrm:diva-330OAI: oai:DiVA.org:nrm-330DiVA: diva2:719986
Projects
Gastrotricha of Sweden - Biodiversity and Phylogeny
Funder
The Swedish Taxonomy Initiative (ArtDatabanken, SLU)
Available from: 2014-05-27 Created: 2014-05-27 Last updated: 2014-06-11Bibliographically approved
In thesis
1. Gastrotricha of Sweden - Biodiversity and Phylogeny
Open this publication in new window or tab >>Gastrotricha of Sweden - Biodiversity and Phylogeny
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Gastrotricha are small aquatic invertebrates with approximately 770 known species. The group has a cosmopolitan distribution and is currently classified into two orders, Chaetonotida and Macrodasyida. The gastrotrich fauna of Sweden is poorly known: a couple of years ago only 29 species had been reported. In Paper I, III, and IV, 5 freshwater species new to science are described. In total 56 species have been recorded for the first time in Sweden during the course of this thesis. Common species with a cosmopolitan distribution, e. g. Chaetonotus hystrix and Lepidodermella squamata, as well as rarer species, e. g. Haltidytes crassus, Ichthydium diacanthum and Stylochaeta scirtetica, are reported. In Paper II molecular data is used to infer phylogenetic relationships within the morphologically very diverse marine family Thaumastodermatidae (Macrodasyida). Results give high support for monophyly of Thaumastodermatidae and also the subfamilies Diplodasyinae and Thaumastodermatinae. In Paper III the hypothesis of cryptic speciation is tested in widely distributed freshwater gastrotrichs. Heterolepidoderma ocellatum f. sphagnophilum is raised to species under the name H. acidophilum n. sp. The results indicate that L. squamata may be a complex of at least two species. In Paper III and V the phylogeny of Chaetonotidae (Chaetonotida), the largest family within Gastrotricha, is inferred. The group suffers from a troubled taxonomy and is hypothesized to be nonmonophyletic. Results show that members of Dasydytidae are nested within the group. Since only 3 of 17 sampled genera are monophyletic, it is hypothesized that the cuticular structures used in current classification do not reflect phylogenetic relationships. The phylogenetic hypothesis generated in Paper V indicates a marine origin of the predominantly limnic Chaetonotidae with a subsequent secondary invasion to marine environments of some taxa.

Place, publisher, year, edition, pages
Stockholm: US-AB, 2011. 34 p.
Keyword
taxonomy, systematics, phylogeny, new species, cryptic species, Chaetonotidae, Dasydytidae, Thaumastodermatidae
National Category
Zoology
Research subject
Diversity of life
Identifiers
urn:nbn:se:nrm:diva-351 (URN)978-91-7447-397-1 (ISBN)
Public defence
2011-12-16, Lilla Hörsalen, Swedish Museum of Natural History, Frescativägen 40, Stockholm, 10:00 (English)
Opponent
Supervisors
Projects
Gastrotricha of Sweden - Biodiversity and Phylogeny
Funder
The Swedish Taxonomy Initiative (ArtDatabanken, SLU)
Available from: 2014-06-11 Created: 2014-06-11 Last updated: 2014-06-11Bibliographically approved

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http://www.mapress.com/zootaxa/2011/f/zt03115p055.pdf

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