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Taxonomy of some European species of Mesochorus, including three new species from Finland and Sweden (Hymenoptera: Ichneumonidae: Mesochorinae)
Swedish Museum of Natural History, Department of Zoology.
2017 (English)In: w-album, ISSN ISSN 1795-665X, Vol. 20, 3-42 p.Article, book review (Refereed) Published
Abstract [en]

Redescriptions of the following seven species are made: Mesochorus gemellus Holmgren, 1860, M. tachypus Holmgren,

1860, M. diversicolor Viereck, 1912, M. brevicollis Thomson, 1886, M. giberius (Thunberg, 1822), M. marginatus Thomson, 1886,

and M. tetricus Holmgren, 1860. Three new species are described: M. marginatoides Vikberg sp. n. from Finland and Sweden, M.

skanensis Vikberg sp. n. from Sweden, and M. ranini Vikberg sp. n. from Finland. The female of M. plumosus Dasch, 1971 is

described from Finland (this species is known earlier only from N. America). A key to females of the eleven studied European

species of Mesochorus is included.

The following formal nomenclatural acts or changes are made: lectotypes are designated for Mesochorus tachypus Holmgren, 1860

and for M. tetricus Holmgren, 1860. Mesochorus tachypus Holmgren, 1860, stat. n. (= M. macrurus Thomson, 1886, syn. n.), M.

diversicolor Viereck, 1912, stat. n., M. brevicollis Thomson, 1886, stat. n., M. marginatus Thomson, 1886, stat. n., and M. tetricus

Holmgren, 1860 (= M. curvicauda Thomson, 1886, syn. n.).

Many females of M. tachypus and M. tetricus were found near the ground in the spruce forests in Janakkala, South Finland very

late in the season (from October to December in 2011-2016). M. cimbicis (Ratzeburg, 1844) has been reared from cocoons of

Trichiosoma sp. (scalesii Leach aggregate) and T. nanae Vikberg & Viitasaari in Finland. The correct primary host of Mesochorus

bipartitus Schwenke, 1999 is Lygus rugulipennis Poppius (Hemiptera: Miridae).

Abstract [fi]

Seuraavat lajit kuvataan uudelleen: Mesochorus gemellus Holmgren, 1860, M. tachypus Holmgren, 1860, M.

diversicolor Viereck, 1912, M. brevicollis Thomson, 1886, M. giberius (Thunberg, 1822), M. marginatus Thomson, 1886, ja M.

tetricus Holmgren, 1860. Ruotsista kuvataan uusi laji Mesochorus skanensis Vikberg sp. n. ja Suomesta kuvataan kaksi uutta lajia:

M. marginatoides Vikberg sp. n. ja M. ranini Vikberg sp. n., joista edellinen myös Ruotsista. Lajien tunnistamisen helpottamiseksi

on laadittu tutkimuskaava tutkitun 11 eurooppalaisen lajin naaraille.

Seuraavat nimistöön vaikuttavat muutokset tehdään: Lajeille Mesochorus tachypus Holmgren ja M. tetricus Holmgren vahvistetaan

lektotyypit. Mesochorus tachypus Holmgren, 1860, stat. n. (= M. macrurus Thomson, 1886, syn.n.), M. diversicolor Viereck, 1912,

stat.n., M. brevicollis Thomson, 1886, stat. n., M. marginatus Thomson, 1886, stat.n. ja M. tetricus Holmgren, 1860 (= M.

curvicauda Thomson, 1886, syn. n.).

Lajien Mesochorus tachypus ja M. tetricus naaraita löytyi runsaasti Janakkalan kuusimetsistä loka-joulukuussa vuosina 2011 - 2016.

Ne ilmeisesti talvehtivat kuusien alla karikkeessa. Laji M. cimbicis (Ratzeburg, 1844) on kasvatettu Suomessa kahdesta

karvanuijapistiäislajista, joista toinen esiintyy Käsivarren Lapissa ja toinen, rämenuijapistiäinen, elää toukkana vaivaiskoivuilla

soilla. Lajin Mesochorus bipartitus Schwenke, 1999 oikea primaari-isäntä on Miridae-heimon lude Lygus rugulipennis. Pohjois-

Amerikasta kuvatun lajin M. plumosus Dasch, 1971 löytöjä esitetään Janakkalasta ja lajin naaras kuvataan.

Place, publisher, year, edition, pages
2017. Vol. 20, 3-42 p.
Keyword [en]
taxonomy, description of new species, parasitic wasps
National Category
Natural Sciences
Research subject
Diversity of life
Identifiers
URN: urn:nbn:se:nrm:diva-2429OAI: oai:DiVA.org:nrm-2429DiVA: diva2:1133785
Available from: 2017-08-16 Created: 2017-08-16 Last updated: 2017-08-21Bibliographically approved

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