Orectochilus punctipennis Sharp, 1884

Lee, Dae-Hyun & Ahn, Kee-Jeong, 2015, A taxonomic review of the Gyrinidae (Coleoptera) in Korea, ZooKeys 509, pp. 87-107 : 95-96

Taxon classification Animalia Coleoptera Gyrinidae

Orectochilus punctipennis Sharp, 1884 Figs 5, 56, 59

Orectochilus punctipennis Sharp, 1884: 449.

Type material examined.

Syntype: 1 ♂ (NHM), with labels as follows: " Orectochilus punctipennis . Types D. S. Yokio. Japan. Lewis, Type, Japan. G. Lewis., Sharp Coll. 1905 –313.”

Additional material examined.

SOUTH KOREA: Gangwon Prov.: 1 ♀, Gangneung-si, Okgyeo-myeon, Jusu-ri, 17.VIII.2011, SW Jung.

Diagnosis.

Length 6.5 mm. Dorsal and ventral surface mostly black; antenna, mouthparts, hypomera, epipleura, front leg brown; middle and hind legs, sternites V–VII yellowish brown. Head without pubescence on vertex and postero-lateral part. Pronotum widest at posterior margin; anterior angle rectangular; posterior angle rounded. Elytra (Fig. 5) widessst at middle; posterior margin acute in dorsal view. Protarsal claw as long as protarsomere 1. Posterior part of mesoventrite bifid. Median lobe of aedeagus shorter than paramere. Apical margin of gonocoxa (Fig. 56) rounded.

Distribution.

Korea, Japan, Russia (Far East) ( Mazzoldi 2003).

Remarks.

Orectochilus punctipennis is recorded for first time in Korea. This species can be distinguished from Orectochilus regimbarti by the small size (less than 7.0 mm) and median lobe of aedeagus shorter than paramere. It also differs from Orectochilus villosus by the black body, posterior margin of the elytron acute, paramere curved at middle and apical margin of gonocoxa (Fig. 56) rounded.

Habitat.

A single female specimen was collected near the margin of a stream with plentiful vegetation and slow flow velocity.