Onichodon Newman, 1838

Otto, Robert L., Muona, Jyrki & Córdoba-Alfaro, Jim, 2023, A new genus and sixteen new species of false click beetles (Coleoptera: Eucnemidae) described from the Heredia Province of Costa Rica with several additional records from the Osa Peninsula and Panama, Insecta Mundi 2023 (991), pp. 1-36 : 15

Genus Onichodon Newman, 1838

Diversity and distribution. Six described species are known in this genus. Five species are present in the Nearctic region. One species is present in Fiji. One undescribed species is present in Southeast Asia. Two new Central American species are known only from Heredia province in Costa Rica. Many misplaced species of Fornax Laporte present in Central and South America may belong in this group.

Diagnosis. Apical margin of frontoclypeal region feebly trilobed and more or less than twice as wide as the distance between antennal sockets; narrow, well-developed basally open lateral antennal grooves present; male protarsomere I simple, with basal sex combs; metacoxal plates medially 3.0–6.0 times wider than laterally; elytral epipleura evenly punctate; last visible ventrite either rounded or slightly emarginate; tarsal claws basally toothed; lateral surfaces of meso- and metatibiae with setae and transverse rows of spine combs; male aedeagus dorsoventrally compressed, without secondary lateral lobes; median lobe simple, with moderately and narrowly bifurcate apices; lateral lobes simple, entire; aedeagal flagellum simple.