Casnonia (Cosnania), Dejean, 1821

Bousquet, Yves, 2012, Catalogue of Geadephaga (Coleoptera, Adephaga) of America, north of Mexico, ZooKeys 245, pp. 1-1722 : 787-788

Subgenus Cosnania Dejean, 1821

Macrotrachelus Latreille, 1818a: 16 [potential nomen oblitum, see Bousquet (2002b: 30)]. Type species: Attelabus pensylvanicus Linnaeus, 1758 by monotypy. Etymology. From the Greek macros (long) and trachelos (neck, by extension pronotum), alluding to the elongate pronotum of the adult [masculine].

Cosnania Dejean, 1821: 2 [potential nomen protectum]. Type species: Attelabus pensylvanicus Linnaeus, 1758 by monotypy. Etymology. Unknown; this is also the case for the spelling Casnonia [feminine]. Note. Casnonia is an incorrect subsequent spelling, first used by Dejean (1825: 170), not currently in prevailing usage. The spelling was in prevailing usage until the 1990s but not attributed to the publication of the original spelling. Therefore Casnonia cannot be considered as the correct original spelling (see ICZN 1999: Article 33.3.1).

Odacanthella Liebke, 1930: 658. Type species: Attelabus pensylvanicus Linnaeus, 1758 by original designation. Etymology. From the generic name Odacantha and the Greek suffix - ella (small, little) [feminine].

Diversity.

Fourteen species are listed in this subgenus by Lorenz (2005: 442) but some (e.g., Cosnania lioptera , Cosnania tetrastigma , and Cosnania emdeni Liebke) are not closely related to the type species, Cosnania pensylvanica . Two North American species belong to this subgenus.