Revision of North American Epigean Species of Asellus (Crustacea: Isopoda). Smithsonian Contributions to Zoology, Number 49

摘要

A taxonomic revision of North America epigean species of Asellus is given based almost entirely upon a study of male material. Descriptions are given of A. communis Say, A. brevicauda brevicauda Forbes, A. brevicauda bivittatus Walker, new combination, A. intermedius Forbes, A. attenuatus Richardson, A. dentadactylus Mackin and Hubricht, A. montanus Mackin and Hubricht, A. kenki Bowman, A. racovitzai racovitzai, new species, A. racovitzai australis, new subspecies, A. forbesi, new species, A. obtusus, new species, A. laticaudatus, new species, A. scrupulosus, new species, A. nodulus, new species, and A. occidentalis, new species. Asellus militaris Hay is synonymized with A. intermedius, and A. tomalensis Harford is regarded as a questionable name. It is suggested that A. aquaticus is absent from the North American continent. A key for the identification of males is given, and phylogenetic relationships are discussed, taking into consideration the ideas of Hennig (1950).