CERATOZETIDAE OF THE WESTERN NORTH AMERICAN ARCTIC

Abstract The Ceratozetidae of arctic western North America, represented by 12 species in 9 genera, are discussed. A new genus, Cyrtozetes, and species, Cyrtozetes denaliensis, are proposed, and Trichoribates copperminensis Hammer, T. polaris Hammer, Svalbardia paludicola Thor, Iugoribates gracilis Sellnick, Diapterobates notatus (Thorell) both adults and immatures, D. variabilis Hammer, Sphaerozetes arcticus Hammer, Fuscozetes sellnicki Hammer, Melanozetes longisetosus Hammer, and Ceratozetes spitsbergensis Thor and C. parvulus Sellnick are redescribed. Immatures of T. polaris, S. paludicola, F. sellnicki, and M. longisetosus are described. Distribution records of Ceratozetes gracilis (Michael) in the western North American arctic are listed. The new combination, Cyrtozetes shiranensis (Aoki and Fujikawa), is proposed. Résumé Les Ceratozetidae provenant de l'arctique de la partie ouest de l'Amérique du Nord, représentées par 12 espèces dans 9 genres, sont étudiées. Un nouveau genre Cyrtozetes et une nouvelle espèce, Cyrtozetes denaliensis, ont été identifiées et Trichoribates copperminensis Hammer, T. polaris Hammer, Svalbardia paludicola Thor, Iugoribates gracilis Sellnick, Diapterobates notatus (Thorell), adultes et juvéniles, D. variabilis Hammer, Sphaeozetes arcticus Hammer, Fuscozetes sellnicki Hammer, Melanozetes longisetosus Hammer, Ceratozetes spitsbergensis Thor et C. parvulus Sellnick sont décrites à nouveau. Les juvéniles de T. polaris, S. paludicola, F. sellnicki et M. longisetosus sont décrites. La distribution de Ceratozetes gracilis dans l'arctique de la partie ouest de l'Amérique du Nord est enregistrée. La nouvelle combinaison Cyrotozetes shiranensis (Aoki et Fujikawa) est identifiée.

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