Euconnus (Euconnus) unpini Hoshina, 2007

Jałoszyński, Paweł, 2022, Euconnus Thomson of Japan: redescriptions of species established by Reitter, Sharp and Franz, new synonyms, and summary of current state of knowledge (Coleoptera, Staphylinidae, Scydmaeninae), Zootaxa 5093 (1), pp. 1-37 : 31

Euconnus (Euconnus) unpini Hoshina

Euconnus (Euconophron) unpini Hoshina, 2007: 18 .

Euconnus (Eupentarius) unpini Hoshina ; Jałoszyński, 2021a: 156, implied, by placing Euconophron as junior synonym of Eupentarius.

Euconnus (Euconnus) unpini Hoshina ; here placed in Euconnus s. str.

Remarks. This species is known to occur on Honshu, and it seems to be unique, judging from the extremely small body (BL ~ 0.9 mm), and the aedeagus that is not similar to male copulatory organs of any other nominal Euconnus species known to occur in Japan. However, this species is known from a single male holotype, whose aedeagus has been distorted during preparation, the parameres seem to be missing, and the endophallus is partially everted, so that endophallic sclerites are almost certainly displaced in relation to their resting position. For this reason, it may be difficult to identify specimens with appropriately prepared aedeagi.

Hoshina (2007) placed E. unpini in Euconophron (currently junior synonym of Eupentarius). However, this species does not show diagnostic characters of Eupentarius, and before Jałoszyński (2021b) it should have been placed in Napochus, which the latter author placed as a junior synonym of Euconnus s. str. Consequently, E. unpini is transferred to the nominotypical subgenus.