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REVISION OF NORTH AMERICAN AGABUS LEACH (COLEOPTERA: DYTISCIDAE): INTRODUCTION, KEY TO SPECIES GROUPS, AND CLASSIFICATION OF THE AMBIGUUS-, TRISTIS-, AND ARCTICUS-GROUPS

Published online by Cambridge University Press:  31 May 2012

D.J. Larson
D.J. Larson
Affiliation:
Department of Biology, Memorial University of Newfoundland, St. John's, Newfoundland, CanadaA1B 3X9
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Abstract

The first of a planned series of papers revising the Nearctic species of the predaceous diving beetle genus, Agabus Leach, is presented. The genus is defined in the broad sense of Sharp (1882) and Fall (1922). The North American species are divided into species groups and diagnostic characters for group recognition are summarized in a key. Assignment of species to these groups is indicated in a checklist of North American species. The ambiguus-, tristis-, and arcticus-groups are defined, their relationships discussed, and included species revised. The ambiguus-group, which is restricted to North America, contains the species A. ambiguus (Say), A. strigulosis (Crotch), A. erythropterus (Say), A. austinii Sharp, and A. klamathensis sp.nov. The tristis-group, which has a Holarctic distribution, contains two species in North America, A. tristis Aubé and A. leptapsis (LeConte). The Holarctic arcticus-group is represented by A. arcticus (Paykull) and A. anthracinus (Mannerheim) in North America. For each species, patterns of variation are described, the North American distributions mapped, and ecological information summarized.

Résumé

Cet article est le premier d’une série portant sur la revision des espèces néartiques de coléoptères aquatiques prédateurs du genre Agabus Leach. Le genre est défini au sens large de Sharp (1882) et Fall (1922). On divise les espèces nord-américaines en groupes d’espèces pour lesquels des caractéristiques diagnostiques dont présentées dans une clé. L’assignation des espèces à ces groupes est indiquée dans une liste des espèces nord-américaines. Les groupes ambiguus, tristis, et arcticus sont définis, leurs relations sont commentées et les espèces regroupées dans chacun sont revisées. Le groupe ambiguus est limité à l’Amérique du Nord et comprend les espèces A. ambiguus (Say), A. strigulosus (Crotch), A. erythropterus (Say), A. austinii Sharp, et A. klamathensis sp.nov. Le groupe tristis a une distribution holartique et comprend deux espèces nord-américaines, A. tristis Aubé et A. laptapsis (LeConte). Le groupe holartique arcticus est représenté en Amérique du Nord par A. arcticus (Paykull) et A. anthracinus (Mannerheim). On décrit les patrons de variation de chaque espèce, on cartographie leur distribution nord-américaine et on résume les informations écologiques disponibles.

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Articles
Information
The Canadian Entomologist , Volume 121 , Issue 10 , October 1989 , pp. 861 - 919
Copyright
Copyright © Entomological Society of Canada 1989

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