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REVISION OF NORTH AMERICAN AGABUS (COLEOPTERA: DYTISCIDAE): THE SEMIVITTATUS-GROUP

Published online by Cambridge University Press:  31 May 2012

D.J. Larson  and
R.W. Wolfe
D.J. Larson
Affiliation:
Department of Biology, Memorial University of Newfoundland, St. John's, Newfoundland, Canada A1B 3X9
R.W. Wolfe
Affiliation:
Division of Math and Science, Reinhardt College, Waleska, Georgia, USA 30183
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Abstract

The Agabus semivittatus-group is revised. The group, which is restricted to temperate North America, contains six species: Agabus semivittatus LeConte, which is almost transcontinental; Agabus johannis Fall in peninsular Florida; Agabus astrictovittatus new species along the Atlantic coast from New York to northern Florida and Alabama; Agabus stagninus (Say) along the Atlantic coast from New York to Florida and along the Gulf of Mexico coast to Louisiana; Agabus flavovittatus new species with a wide distribution east of the Great Plains, from southern Ontario to Mississippi and eastern Texas but not along the Atlantic coast; and Agabus texovittatus new species in Texas. Agabus stagninus and A. flavovittatus hybridize in southeastern Pennsylvania. The placement of Agabus texanus Sharp as a junior synonym of A. semivittatus is confirmed. A lectotype is designated for Agabus spilotus LeConte (= A. semivittatus). A neotype is designated for A. stagninus. A key to species is presented and, for each species, the following information is provided: description; illustrations of taxonomically important characters; morphological measurements on selected population samples; notes on relationships, variation, and ecology; and a map of collection localities. A cladistic analysis of the relationships of the group within Agabus indicated that the americanus-, spinipes-, and confusus-groups belong to the same clade as the semivittatus-group and that the seriatus-group is sister to this clade. Within the semivittatus-group, there are three well-defined subgroups as follows: A. semivittatus; A. johannis and A. astrictovittatus; and A. stagninus, A. flavovittatus, and A. texovittatus.

Résumé

Le groupe Agabus semivittatus a fait l’objet d’une révision. Ce groupe, restreint à la zone tempérée nord-américaine, compte six espèces : A. semivittatus LeConte, presque transcontinental, A. johannis Fall, dans la péninsule de Floride, A. astricovittatus, nouvelle espèce, répartie le long de la côte atlantique du New York au nord de la Floride et à l’Alabama, A. stagninus (Say), aussi sur la côte atlantique du New York à la Floride et le long de la côte du Golfe jusqu’à la Louisiane, A. flavovittatus, nouvelle espèce, largement répandue à l’est des Grandes Plaines, du sud de l’Ontario au Mississippi et à la partie est du Texas, mais pas sur la côte atlantique, enfin A. texovittatus, nouvelle espèce, du Texas. Il y a hybridation entre Agabus stagninus et A. flavovittatus dans le sud-est de la Pennsylvanie. Nous confirmons ici qu’Agabus texanus Sharp est bien un synonyme récent d’A. semivittatus. Des lectotypes ont été désignés pour A. spilotus LeConte (= A. semivittatus). Un néotype d’A. stagninus a été choisi. On trouvera ici une clé des espèces et, pour chaque espèce, les informations suivantes : description, illustration des caractères diagnostiques, mesures morphologiques d’échantillons choisis de la population, notes sur les liens de parenté, sur la variation et sur l’écologie, enfin une carte des sites de récolte. L’analyse cladistique de la position du groupe au sein du genre Agabus a révélé que les groupes americanus, spinipes et confusus appartiennent au même clade que le groupe semivittatus, et que le groupe seriatus est le groupe soeur de ce clade. Au sein du groupe semivittatus, il existe trois sous-groupes bien définis : (1) A. semivittatus; (2) A. johannis et A. adstrictovittatus; (3) A. stagninus, A. flavovittatus et A. texovittatus.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 130 , Issue 1 , February 1998 , pp. 27 - 54
Copyright
Copyright © Entomological Society of Canada 1998

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