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

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 the Agabus opacus- and lineellus-groups, as defined by Larson (1989), are combined and revised as members of the A. opacus-group. The A. opacus-group contains 13 species, namely: A. hypomelas Mannerheim, A. vancouverensis Leech, A. verisimilis Brown, A. vandykei Leech, A. wasastjernae (Sahlberg), A. opacus Aubé, A. confertus LeConte, A. euryomus sp.nov., A. walsinghami (Crotch), A. jimzim sp.nov., A. lineellus LeConte, A. discors LeConte, and A. austrodiscors sp.nov. Agabus wasastjernae and A. opacus are Holarctic and boreal; the remaining 11 species are confined to the Cordilleran region of western North America. Character distribution does not support recognition of subspecies of A. hypomelas, therefore A. hypomelas irregularis Mannerheim is regarded as a synonym of A. hypomelas. A lectotype is designated for A. discors LeConte. A phylogenetic tree of the hypothesized relationships between the species is presented.

A key to the species of the group is included. For each species, the following information is provided: synonymy; description and illustration of taxonomically important characters; notes on relationships, variation, distribution, and ecology; and a map of North American collection localities.

Résumé

Les espèces des groupes Agabus opacus et A. lineellus, définis par Larson (1989), sont combinées dans le groupe A. opacus, dont on trouvera ici la révision. Le groupe A. opacus contient 13 espèces, A. hypomelas Mannerheim, A. vancouverensis Leech, A. verisimilis Brown, A. vandykei Leech, A. wasastjernae (Sahlberg), A. opacus Aubé, A. confertus LeConte, A. euryomus sp.nov., A. walsinghami (Crotch), A. jimzim sp.nov., A. lineellus LeConte, A. discors LeConte et A. austrodiscors sp.nov. Agabus wasastjernae et A. opacus sont des espèces holarctiques et boréales et les 11 autres espèces sont restreintes à la région de la Cordillère de l’ouest nord-américain. La répartition des caractéristiques ne justifie pas la reconnaissance de sous-espèces au sein de l’espèce A. hypomelas et A. hypomelas irregularis Mannerheim est donc considéré comme un synonyme d’A. hypomelas. Un lectotype a été choisi pour représenter A. discors LeConte. Un arbre phylogénétique illustre les relations hypothétiques entre les espèces.

Une clé permettra d’identifier les espèces du groupe. Pour chaque espèce, les information suivantes sont données : synonymies, description et illustration des caractéristiques diagnostiques importantes, commentaires sur les liens de parenté, variation, répartition et écologie, carte où sont indiqués les sites de récolte en Amérique du Nord.

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Type
Articles
Information
The Canadian Entomologist , Volume 128 , Issue 4 , August 1996 , pp. 613 - 665
Copyright
Copyright © Entomological Society of Canada 1996

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References

Anderson, R.D. 1962. The Dytiscidae (Coleoptera) of Utah: Keys, original citation, types and Utah distribution. Great Basin Naturalist 22: 54–75.Google Scholar
Aubé, C. 1836–1838. Iconographie et historie naturelle des coléoptères d'Europe. Volume 5. Hydrocanthares. Paris. 416 pp.Google Scholar
Balfour-Browne, F. 1950. British Water Beetles. 2. Ray Society, No. 134. London. 394 pp.Google Scholar
Biström, O. 1987. Lists of the insect types in the Zoological Museum, University of Helsinki. Coleoptera: Haliplidae, Dytiscidae, Gyrinidae. Acta Entomologica Fennica 48: 33–40.Google Scholar
Brown, W. J. 1932. New species of Coleoptera III. The Canadian Entomologist 64: 3–12.CrossRefGoogle Scholar
Crotch, G.R. 1873. Revision of the Dytiscidae of the United States. Transactions of the American Entomological Society 4: 383–424.Google Scholar
Falkenström, G. 1929. 9. Kritische Bemerkungen über einige Dytisciden-Arten. Zoologischer Anzeiger 84: 5–69.Google Scholar
Fall, H.C. 1922. A Review of the North American Species of Agabus. Mount Vernon, New York. 36 pp.Google Scholar
Fall, H.C. 1926. A list of the Coleoptera taken in Alaska and adjacent parts of the Yukon territory in the summer of 1924. Pan-Pacific Entomologist 2: 127–154.Google Scholar
Farris, J.S. 1988. Hennig86. Version 1.5.Google Scholar
Fery, H., and Nilsson, A.N.. 1993. A revision of the Agabus chalconatus- and erichsoni-groups (Coleoptera: Dytiscidae), with a proposed phylogeny. Entomologica Scandinavica 24: 79–108.Google Scholar
Hatch, M.H. 1953. Beetles of the Pacific Northwest, Part 1: Introduction and Adephaga. University of Washington Publications in Biology 16: 1–340.Google Scholar
Hilsenhoff, W.L. 1993. Dytiscidae and Noteridae of Wisconsin (Coleoptera). IV. Distribution, habitat, life cycle, and identification of species of Agabini. Great Lakes Entomologist 26: 173–197.Google Scholar
Horn, G. 1883. Miscellaneous notes and short studies of North American Coleoptera. Transactions of the American Entomological Society 10: 269–312.Google Scholar
Jacobson, J.J. 1908. Coleoptera of Russia and eastern Europe. St. Petersburg. [In Russian.]Google Scholar
Kamiya, K. 1938. A systematic study of the Japanese Dytiscidae. Journal Tokyo Nogyo Daigaku 5: 1–68.Google Scholar
Larson, D.J. 1975. The predaceous water beetles (Coleoptera: Dytiscidae) of Alberta: Systematics, natural history and distribution. Quaestiones Entomologicae 11: 245–498.Google Scholar
Larson, D.J. 1987. Revision of North American species of Ilybius Erichson (Coleoptera: Dytiscidae), with systematic notes on palaearctic species. Journal of the New York Entomological Society 95: 341–413.Google Scholar
Larson, D.J. 1989. Revision of North American Agabus Leach (Coleoptera: Dytiscidae): Introduction, key to species groups, and classification of the ambiguus-, tristis-, and arcticus-groups. The Canadian Entomologist 121: 861–919.CrossRefGoogle Scholar
Larson, D.J. 1991. Revision of North American Agabus Leach (Coleoptera: Dytiscidae): elongatus-, zetterstedti-, and confinis-groups. The Canadian Entomologist 123: 1239–1317.Google Scholar
Larson, D.J. 1994. Revision of North American Agabus Leach (Coleoptera: Dytiscidae): lutosus-, obsoletus-, and fuscipennis-groups. The Canadian Entomologist 126: 135–181.Google Scholar
Larson, D.J., and Nilsson, A.N.. 1985. The Holarctic species of Agabus (sensu lato) Leach (Coleoptera: Dytiscidae). The Canadian Entomologist 117: 119–130.Google Scholar
LeConte, J.L. 1861. New species of Coleoptera inhabiting the Pacific district of the United States. Proceedings of the Academy of Natural Sciences of Philadelphia 13: 338–359.Google Scholar
Leech, H.B. 1937. A new North American Agabus, with notes on other species (Coleoptera: Dytiscidae). The Canadian Entomologist 69: 146–150.CrossRefGoogle Scholar
Leech, H.B. 1942. New or insufficiently known Nearctic species and subspecies of Agabus (Coleoptera, Dytiscidae). The Canadian Entomologist 74: 125–136.Google Scholar
Leech, H.B. 1945. The specific characters and distribution of Agabus vancouverensis and A. hypomelas (Coleoptera, Dytiscidae). The Canadian Entomologist 77: 77–78.CrossRefGoogle Scholar
Leech, H.B. 1949. New species and subspecies of Nearctic water beetles (Coleoptera: Dytiscidae and Hydrophilidae). The Wasmann Collector 7: 243–256.Google Scholar
Leech, H.B., and Chandler, H.P.. 1956. Aquatic Coleoptera. pp. 293–371in Usinger, R.L. (Ed.), Aquatic Insects of California. University of California Press, Berkeley, CA.CrossRefGoogle Scholar
Mannerheim, C.G. 1843. Beitrag zur Kaefer-Fauna der Aleutischen Inseln, der Inseln Sitkha und Neu-Califomiens. Bulletin de la Société Imperiale des Naturalistes de Moscou 16, 2: 12–314.Google Scholar
Mannerheim, C.G. 1853. Dritter Nachtrag zur Kaefer-Fauna der Nord-Amerikanischen Laender des Russischen Reiches. Bulletin de la Société Imperiale des Naturalistes de Moscou 26, 3: 95–294.Google Scholar
Nilsson, A.N. 1982. The larval stages of Agabus elongatus and Agabus wasastjernae (Coleoptera: Dytiscidae). Entomologica Scandinavica 13: 69–76.Google Scholar
Nilsson, A.N. 1985. Life cycle and larval morphology in the predaceous water beetle Agabus opacus Aubé (Coleoptera: Dytiscidae). Entomologica Scandinavica 15: 492–496.CrossRefGoogle Scholar
Nilsson, A.N. 1986. Life cycles and habitats of the northern European Agabini (Coleoptera: Dytiscidae). Entomologica Basiliensia 11: 391–417.Google Scholar
Nilsson, A.N., and Kholin, S.K.. 1994. The diving beetles (Coleoptera, Dytiscidae) of Sakhalin—an annotated check list. Entomologisk Tidskrift 115: 143–156.Google Scholar
Sahlberg, C.R. 1824. Dissertatio entomologica Insecta Fennica enumerans. Vol. 1, part II: 153–168. Aboae.Google Scholar
Sahlberg, J. 1873. Enumeratio Coleoperorum Carnivorum Fenniae. Notiser ur Sällskapets Pro Fauna et Flora Fennica Förhandlingar 14: 41–200.Google Scholar
Sharp, D. 1882. On aquatic carnivorous Coleoptera or Dytiscidae. Scientific Transactions of the Royal Dublin Society 2: 17–1003.Google Scholar
Wallis, J.B. 1926. Some new Coleoptera. The Canadian Entomologist 58: 89–95.Google Scholar
Young, F.N. 1960. The colors of desert water beetles—environmental effect or protective coloration? Annals of the Entomological Society of America 53: 422–425.CrossRefGoogle Scholar
Zaitzev, P.A. 1953. Fauna of the U.S.S.R., Vol. 4. Amphizoidae, Hygrobiidae, Dytiscidae, Gyrinidae. English Translation (1972), Israel Program for Scientific Translations. Jerusalem. 401 pp.Google Scholar
Zimmermann, A. 1934. Monographie der palaarktischen Dytisciden. V. Colymbetinae. (1. Teil: Copelatini, Agabini: Gattung Gaurodytes Thoms.). Koleopterologische Rundschau 20: 138–214.Google Scholar