Euconnus Thomson

Jałoszyński, Paweł, 2024, Subgenera Cladoconnus Reitter and Tetramelus Motschulsky of Euconnus Thomson discovered in China (Coleoptera, Staphylinidae, Scydmaeninae), Zootaxa 5514 (3), pp. 232-256 : 233

Genus Euconnus Thomson

Euconnus Thomson, 1859: 61 . Type species: Pselaphus hirticollis Illiger, 1798 (des. orig.).

Remarks. The subgeneric system of Euconnus was a subject of a long series of publications ( Jałoszyński 2012, 2013b, 2015a, b, c, 2016a, b, c, d, 2017a, b, c, d, e, f, 2018a, b, 2019a, 2020a, b, 2021a, b, 2022b, Jałoszyński & Newton 2017). Many taxonomic issues have been solved, but the current subgeneric division of Euconnus is not phylogeny-based and certainly will require profound changes.

Euconnus is characterized by the following set of features: eyes (if present) situated closer to mandibular bases and antennal fossae than to occipital constriction; lateral submental sutures lacking; mesoventral intercoxal process present, carinate; notosternal sutures complete; hypomeral ridges at least partly developed or at least inner regions of hypomera delimited from outer regions by abrupt change in microsculpture; each elytron with two asetose basal pits (reduced in some species); metaventral intercoxal process widely or narrowly (but clearly) separating metacoxae; and aedeagus with free rod-like parameres. Euconnus can be identified using a preliminary key (and comments related to the yet unclear diagnosis) to world Stenichnini genera published recently ( Jałoszyński 2024).