On the taxonomic placement of Geodromicus pusillus Coiffait, 1983 (Coleoptera: Staphylinidae: Omaliinae)

摘要

Luze (1903:116) described the subgenus Trichodromeus Luze, 1903 for two species of Geodromicus L. Redtenbacher, 1857. Bordoni (1984:57) identified this taxon as a separate genus. Zerche (1992:126) redescribed Trichodromeus, synonymized NeogeodromicusBordoni, 1985 with it and proposed phylogenetic relationships of this taxon. However, many Central Asian species previously described by various authors within Geodromicus also belong to the genus Trichodromeus.During study of the material from Kashmir, provided to me for identification by my colleague Dr. M. Tronquet, and after study of the type material of Geodromicus pusillus Coiffait, 1983, it was apparent to me that this species has the characteristic morphological features (Zerche, 1992) of the genus Trichodromeus: body elongate and moderately convex, 3.7-8.6 mm in length; variable coloration from light-colored to dark brown, with body appendages and hind margins of pronotum lighter; punctation of forebody dense and moderately strong, interstices between punctures with well-defined microsculpture; eyes approximately as long as temples; temples expanded in varying degrees; ocelli well developed or reduced; mandibles with four teeth: tooth II and III of the left mandible elongate, and tooth IV of the left mandible of different shape, approximately rectangular; segment III of labial palpi expanded at apex, conspicuously dense and finely pubescent; segments II and IV glossy; pronotum slightly or significantly wider than head, distinctly transverse; metatarsi shorter than half of length of metatibia; median lobe of the aedeagus moderately to very slender; internal sac with long parallel structures, each with specifically modified subapical plates; flagellum long, coiled in basal part; and parameres very slender.