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Diversity of Placusa (Coleoptera: Staphylinidae, Aleocharinae) in Canada, with descriptions of two new species

Published online by Cambridge University Press:  31 May 2012

Jan Klimaszewski ,
Georges Pelletier ,
Carole Germain ,
Christian Hébert ,
Lee M. Humble  and
Neville N. Winchester
Jan Klimaszewski*
Affiliation:
Natural Resources Canada, Canadian Forest Service, Laurentian Forestry Centre, PO Box 3800, Sainte-Foy, Quebec, Canada G1V 4C7
Georges Pelletier
Affiliation:
Natural Resources Canada, Canadian Forest Service, Laurentian Forestry Centre, PO Box 3800, Sainte-Foy, Quebec, Canada G1V 4C7
Carole Germain
Affiliation:
Natural Resources Canada, Canadian Forest Service, Laurentian Forestry Centre, PO Box 3800, Sainte-Foy, Quebec, Canada G1V 4C7
Christian Hébert
Affiliation:
Natural Resources Canada, Canadian Forest Service, Laurentian Forestry Centre, PO Box 3800, Sainte-Foy, Quebec, Canada G1V 4C7
Lee M. Humble
Affiliation:
Natural Resources Canada, Canadian Forest Service, Pacific Forestry Centre, 506 Burnside Road, Victoria, British Columbia, Canada V8Z 1M5
Neville N. Winchester
Affiliation:
Department of Biology, University of Victoria, PO Box 1700, Victoria, British Columbia, Canada V8W 2Y2
*
1 Author to whom all correspondence should be addressed (E-mail: [email protected]).
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Abstract

The Canadian species of the genus Placusa Erichson are reviewed. Eight species are recorded, of which four constitute new Canadian records (P. despecta Erichson, P. incompleta Sjöberg, P. petulans Casey, and P. vaga Casey) and two are new to science (P. pseudosuecica Klimaszewski sp.nov., and P. canadensis Klimaszewski sp.nov.). Placusa turbata Casey, one of the two species previously recorded from British Columbia, is here considered a synonym of P. tachyporoides (Waltl) and is reported for the first time from eastern Canada (New Brunswick, Ontario, Quebec). New data are provided on the systematics, distribution, bionomics, and relationships of selected North American species. A key to the species occurring in Canada is presented with illustrations of the median lobe of the aedeagus, spermatheca, male tergite 8, antennae, and outline drawings of the head and adult forebody for each species. Selected Palearctic species are also illustrated for easy comparison with the closely related Nearctic species. The Canadian distribution is presented on contour maps, and world distribution is discussed for all species. The following lectotypes are designated for the Nearctic species which were described from more than one specimen without former holotype designation: Casey (1893, 1911): P. frosti, P. strata, P. tacomae, P. turbata; Erichson (1840): P. despecta; and Sachse (1852): Oxypoda minuta Sachse. Oxypoda minuta is transferred to the genus Placusa and newly synonymized with P. despecta Erichson (1840).

Résumé

Les espèces canadiennes du genre Placusa Erichson ont été révisées. Huit espèces ont été recensées au Canada : quatre d’entre elles constituent de nouvelles mentions canadiennes (P. despecta Erichson, P. incompleta Sjöberg, P. petulans Casey, P. vaga Casey) et deux sont nouvelles pour la science (P. pseudosuecica Klimaszewski sp.nov. et P. canadensis Klimaszewski sp.nov.). Placusa turbata Casey, une des deux espèces précédemment recensées au Canada (Colombie-Britannique), est maintenant considérée comme un synonyme de P. tachyporoides (Waltl) et est rapportée pour la première fois dans l’est du Canada (Nouveau-Brunswick, Ontario, Québec). De nouvelles données sont fournies sur la systématique, la répartition géographique, la biologie et les relations phylogéniques des espèces nord-américaines sélectionnées. Une clé des espèces canadiennes est présenté avec des illustrations du lobe médian de l’aédéage, la spermathèque, le tergite 8 du mâle, les antennes ainsi que les profils de la tête, du pronotum et des élytres de chacune des espèces. Les organes génitaux de quelques espèces paléarctiques sont aussi illustrées pour fin de comparaison avec les espèces néarctiques très apparentées. La distribution canadienne est présentée à l’aide de cartes géographiques et la distribution mondiale est discuté pour toutes les espèces. Les lectotypes suivants ont été désignés pour les espèces néarctiques qui ont été décrites à l’aide de plusieurs spécimens sans avoir été assignées à un holotype : Casey (1893, 1911) : P. frosti, P. strata, P. tacomae, P. turbata; Erichson (1840) : P. despecta; et Sachse (1852) : Oxypoda minuta Sachse. Oxypoda minuta a été transférée dans le genre Placusa et a nouvellement été synonymisée avec P. despecta Erichson (1840).

Type
Articles
Information
The Canadian Entomologist , Volume 133 , Issue 1 , February 2001 , pp. 1 - 47
Copyright
Copyright © Entomological Society of Canada 2001

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