Cephennomicrus Reitter (Coleoptera, Staphylinidae, Scydmaeninae) of Japan and Taiwan: taxonomic notes, ten new species and comparative morphology of nomurai and taiwanensis species groups

Abstract

Cephennomicrus Reitter, 1907 (Staphylinidae, Scydmaeninae, Cephenniini) of Japan and Taiwan is revised. Four species groups are established for the following species: the nomurai group—C. nomurai (Jałoszyński & Hoshina, 2003) (Japan), C. hobbiti (Jałoszyński & Hoshina, 2003) (Japan), C. disjunctus (Jałoszyński, S. Arai & K. Arai, 2004) status n. (Japan), C. inflatus sp. n. (Taiwan), and C. crucifer sp. n. (Taiwan); the taiwanensis group—C. taiwanensis (Jałoszyński, 2004) (Taiwan), C. iriomotensis sp. n. (Japan), C. nagoanus sp. n. (Japan), C. tsurui sp. n. (Taiwan), C. delicatissimus sp. n. (Taiwan), and C. imago sp. n. (Taiwan); the japonigenus group—C. japonigenus (Jałoszyński & Hoshina, 2003) (Japan), and C. pseudojaponigenus sp. n. (Japan); the fujianus group—C. fujianus (Jałoszyński, 2005) (from China, not treated in this paper), and C. pseudofujianus sp. n. (Taiwan). Three species remain incertae sedis within the genus: C. okinawanus (Jałoszyński, S. Arai & K. Arai, 2004) (Japan), C. cactiformis (Jałoszyński & Hoshina, 2003) (Japan), and C. taitungensis sp. n. (Taiwan). Habitus of all treated species and aedeagi are illustrated. Detailed morphology of the nomurai and taiwanensis species groups was studied, described and illustrated based on disarticulated specimens of C. nomurai and C. delicatissimus. Comparative study suggests a separate position of the nomurai group as a subgenus or genus; however, Oriental Cephennomicrus must be studied in detail before formal taxonomic changes can be made.