Micrillus coloratus, Assing, 2018

Assing, Volker, 2018, A revision of Palaearctic and Oriental Scymbalium and Micrillus III. New species, new combinations, and additional records (Coleoptera: Staphylinidae: Paederinae), Linzer biologische Beiträge 50 (2), pp. 977-996 : 992

Micrillus coloratus group

This newly established species group includes two species, both of them described below: M. coloratus from Cambodia and M. rougemonti from Sri Lanka. Regarding the structure of the maxillary palpi, the shape of the protarsi, the shape of the head, and the shape of the male sternite VIII they are similar to the species of the M. suturalis group. They are, however, distinguished from them by distinctly smaller body size, less slender antennae (preapical antennomeres transverse), a larger head (in relation to pronotum), the shape of the pronotum (slender and only indistinctly tapering posteriad), much sparser punctation of the head and the pronotum, a broadly impunctate median band on the pronotum, less strongly reduced abdominal sternite IX and tergite X, and a much smaller (in relation to body size) and more compact aedeagus without series of spines in the internal sac. They differ from the - often similarly small - species of the M. aegyptiacus group by the shape of the male sternite VIII ( M. aegyptiacus group: deeply and narrowly incised posteriorly), a symmetric aedeagal capsule, and internal structures of the aedeagus of different general morphology.