Brachygluta corniventris

Chandler, Donald S., Sabella, Giorgio & Bückle, Christoph, 2015, A revision of the Nearctic species of Brachygluta Thomson, 1859 (Coleoptera: Staphylinidae: Pselaphinae), Zootaxa 3928 (1), pp. 1-91 : 35

The corniventris species-group

This group holds a single species, B. corniventris , where the male has complex male modifications of tergites 1–2 that are generally similar to species like B. floridana of the abdominalis species-group. However, it is the only species that has an elongate stalked tubercle arising at the base of tergite 1, with the tubercle apex being flat and setose. This species also has a large, multidentate tooth in the internal sac of the aedeagus, that is strikingly similar to the multidentate tooth found in the internal sac of B. infinita , a species that lacks obvious male characters on the tergites, and has only ventrite 3 modified for the male. If the unique multidentate tooth is treated as a shared derived character, then two otherwise very different species would be placed together. At this time we are maintaining the two species as separate groups.