Revision of the genus Xenonychus (Coleoptera: Histeridae)
Acta Entomologica Musei Nationalis Pragae 52(1): 147-159, 2012
Abstract: Genus Xenonychus Wollaston, 1864 of the subfamily Saprininae is revised herein.
It now contains three species: X. tridens (Jacquelin du Val, 1852), X.
aralocaspius Kryzhanovskij, 1976 in Kryzhanovskij & Reichardt (1976) and X.
somaliensis (Thérond, 1963) comb. nov. (transferred from Styphrus Motschulsky,
1845). The three species differ only in minor external characters. Xenonychus
tridens and X. aralocaspius are most readily separated based on their male
terminalia, especially aedeagi. All three species are diagnosed and their
morphological differences are illustrated using SEM photographs. Male genitalia
of X. aralocaspius and X. tridens are illustrated, and a key to the species
Key words: Histeridae, Saprininae, Xenonychus, taxonomic revision, Palaearctic Region, Afrotropical Region