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REVISION OF NORTH AMERICAN AGABUS LEACH (COLEOPTERA: DYTISCIDAE): LUTOSUS-, OBSOLETUS-, AND FUSCIPENNIS-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, Canada A1B 3X9
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Abstract

Species of Agabus of the lutosus-, obsoletus-, and fuscipennis-groups, as defined by Larson (1989), are revised. Members of the lutosus- and obsoletus-groups are restricted to the Cordilleran and Great Plains regions of temperate western North America. Within this region, the species of each group are largely parapatric. Three species are assigned to the lutosus-group: A. lutosus LeConte along the Pacific Coast; A. griseipennis LeConte in the Great Basin, Rocky Mountain, and Great Plains regions; and A. rumppi Leech in the southern deserts. Agabus lutosus and A. griseipennis hybridize in the Pacific Northwest; A. lutosus mimus Leech is synonymized with A. lutosus. The obsoletus-group contains five species: A. obsoletus LeConte, A. morosus LeConte, and A. ancillus Fall along the Pacific Coast and the Sierra Nevada Mountains; A. hoppingi Leech in the Sierra Nevada Mountains; and A. obliteratus LeConte, containing two subspecies, A. o. obliteratus and A. o. nectris Leech, new status, with a wide range including the Great Plains and Cordillera but not reaching the Pacific Coast. The four species of the fuscipennis-group, A. ajax Fall, A. coxalis Sharp, A. fuscipennis (Paykull), and A. infuscatus Aubé, are boreal and all except A. ajax are Holarctic. Agabus coxalis is restricted to northwestern North America, the other three species are transcontinental.For each species the following information is provided: synonymy, description, and illustrations of taxonomically important characters; notes on relationships, variation, distribution, and ecology; and a map of North American collection localities. Group diagnoses and keys to the species of each group are presented. A correction to the key to species groups of North American Agabus (Larson 1989) is made with the addition of a couplet to include the obsoletus-group. Lectotypes are designated for A. discolor LeConte and A. obliteratus LeConte.

Résumé

Les espèces d’Agabus des groupes lutosus, obsoletus et fuscipennis, tels que définis par Larson (1989), ont fait l’objet d’une révision. Les espèces des groupes lutosus et obsoletus sont restreintes aux régions de la Cordillère et des Grandes Plaines dans la zone tempérée de l’ouest nord-américain. Dans ces régions, les espèces de chaque groupe sont surtout parapatriques. Trois espèces sont placées dans le groupe lutosus : A. lutosus LeConte, le long de la côte du Pacifique; A. griseipennis LeConte, dans les régions du Grand Bassin, des Rocheuses et des Grandes Plaines; A. rumppi Leech, dans les déserts du sud. Agabus lutosus et A. griseipennis s’hybrident dans la région du nord-ouest; A. lutosus mimus Leech est synonymisée à A. lutosus. Le groupe obsoletus contient cinq espèces : A. obsoletus LeConte, A. morosus LeConte et A. ancillus Fall le long de la côte du Pacifique et dans les montagnes de la Sierra Nevada; A. hoppingi Leech dans les montagnes de la Sierra Nevada; A. obliteratus LeConte, qui compte deux sous-espèces, A. o. obliteratus et A. o. nectris Leech, nouveau statut, très répandues dans les Grandes Plaines et la Cordillère, mais n’atteignant pas la côte du Pacifique. Les quatre espèces du groupe fuscipennis, A. ajax Fall, A. coxalis Sharp, A. fuscipennis (Paykull) et A. infuscatus Aubé, sont boréales et toutes, sauf A. ajax, sont holarctiques. Agabus coxalis est restreinte au nord-ouest de l’Amérique du Nord et les trois autres espèces sont transcontinentales.Pour chacune des espèces on trouvera les informations suivantes : synonymie, description et illustration des caractères diagnostiques; notes sur les liens de parenté, variation, répartition et écologie; une carte des sites de récolte en Amérique du Nord est également donnée. La diagnose du groupe et des clés d’identification permettront de reconnaître les espèces de chaque groupe. Des corrections sont apportées à la clé des groupes d’espèces du genre Agabus en Amérique du Nord (Larson 1989) et un couplet est ajouté pour permettre l’intégration du groupe obsoletus. Des lectotypes d’A. discolor LeConte et d’A. obliteratus LeConte ont été choisis.

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Type
Articles
Information
The Canadian Entomologist , Volume 126 , Issue 1 , February 1994 , pp. 135 - 181
Copyright
Copyright © Entomological Society of Canada 1994

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