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TAXONOMY, VARIATION, AND ZOOGEOGRAPHY OF TENTHREDO MAXIMA (NORTON) (HYMENOPTERA: TENTHREDINIDAE)

Published online by Cambridge University Press:  31 May 2012

Henri Goulet  and
Louise Dumouchel
Henri Goulet
Affiliation:
Centre for Land and Biological Resources Research, Agriculture Canada, Ottawa, Ontario, Canada K1A 0C6
Louise Dumouchel
Affiliation:
Centre for Land and Biological Resources Research, Agriculture Canada, Ottawa, Ontario, Canada K1A 0C6
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Abstract

Tenthredo retura Ross is here placed in synonymy under T. maxima (Norton) as the subspecies T. maxima retura Ross (syn.nov., stat.nov.). The range of T. maxima is associated with montane meadows or semi-open forest habitats in the montane zone of the Rockies, the Cascades, and the Sierra Nevada. Following the analysis of 24 characters from 2405 specimens, we recognized 12 geographically distinct populations, clustered into two subspecies, T. m. maxima and T. m. retura. Originally included in the originalis group of the genus Tenthredo, T. maxima is characterized as a group of its own with no close relatives in North America. We describe the species and its subspecies, give their distribution, discuss their geographical variation, and attempt to reconstruct their zoogeographical history during the Pleistocene.

Résumé

Tenthredo retura Ross est placé ici dans la sous-espèce T. maxima retura (syn.nov., stat.nov.) en tant que synonyme de T. maxima (Norton). La distribution de l’espèce s’étend le long des zones montagneuses des Rocheuses, des Cascades et de la Sierra Nevada, dans les prés ou dans les éclaircis des habitats forestiers. Suite à l’analyse de 24 caractères chez 2405 spécimens, nous reconnaissons 12 populations distinctes rassemblées en deux sous-espèces, T. m. maxima et T. m. retura. L’espèce T. maxima faisait originalement partie du groupe originalis du genre Tenthredo. Nous la caractérisons désormais dans un groupe à part, qui ne possède aucun proche parent en Amérique du Nord. Dans ce travail, nous décrivons l’espèce et les sous-espèces ainsi que leur distribution, nous discutons de la variation géographique, et tentons de reconstruire l’histoire zoogéographique du groupe durant le Pléistocène.

Type
Articles
Information
The Canadian Entomologist , Volume 126 , Issue 3 , June 1994 , pp. 729 - 774
Copyright
Copyright © Entomological Society of Canada 1994

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