Revision Of The Genus Selonodon Latreille

The genus Selonodon Latreille is revised, with a key to males and descriptions provided for 25 species. Nomenclatural history of the name Selonodon is reviewed. Cebrionid biology is discussed, including geographic distribution and phenology or selected Selonodon species. For the genus, synonymies, adult diagnosis, and adult description are included, along with discussion of species’ diagnostic characters. At the species level, synonymies, type material, adult male diagnosis, adult description, geographic distribution, activity period, and. material examined are given. The following 17 species from the southern United States are described as new: Selonodon appalachiensis (Georgia), S. archboldi (Florida), S. depressifrons (Texas), S. ferrugineus (Georgia), S. floridensis (Florida), S. fulvus (Texas), S. gracilis (Tennessee), S. medialis (Alabama), S. mississippiensis (Mississippi), S. obscurus (Alabama), S. orestes (Tennessee), S. papillatus (Tennessee), S. parvus (Oklahoma), S. perplexus (Alabama), S. sagittiformis (Texas), S. santarosae (Florida), and S. similis (Florida). The following new specific synonyms are recognized (junior synonym[s] first): S. pallidipennis (Van Dyke) = S. abnormis (Werner); S. emarginatus (Schaeffer), S. knausi (Van Dyke) and S. bruesi (Werner)= S. compositus (Fall); S. confusus (LeConte) = S. simplex (LeConte); S. antennatus (Schaeffer) and S. atokanus (Werner) = S. speratus (Fall). Cladistic analysis is used as a basis for a phylogenetic hypothesis of the genus. Six species groups containing 23 species are recognized; the relationships of two species remain uncertain. A preferred cladogram is presented, and species relationships are analyzed. Geographic data for Selonodon are summarized. The trend of phyletic size increase in Selonodon is briefly discussed.