Amphiops Erichson, 1843

Fenglong, J. I. A., 2014, A revisional study of the Chinese species of Amphiops Erichson (Coleoptera, Hydrophilidae, Chaetarthriini), Journal of Natural History 48 (17), pp. 1085-1101 : 1086

Amphiops Erichson, 1843

Amphiops Erichson, 1843: 229 . Type species: Hydrophilus gibbus Illiger (designation: Knisch 1924: 259). = Cyprimorphus Fairmaire, 1873: 334 . Type species: Cyprimorphus compressus Fairmaire (= Coelostoma senegalense Castelnau ) (monotypy). – Syn.: Zaitzev, 1908: 399.

This genus is very easy to recognize by the combination of the following characters: body very strongly rounded and very strongly convex, almost semiglobular; eyes completely divided by a lateral canthus into dorsal and ventral parts; antennae eight-segmented; scutellum elongate; visible part of first abdominal ventrite short and without or with very short carina medially, without a fringe of long hairs or stiff setae, but with fine setae rising from the basal margin of ventrite; large part of first abdominal segment completely covered by metacoxae, with a pair of large cavities laterally and sharp carina medially; abdominal ventrites 2 to 5 covered by hyaline mass; fifth abdominal ventrite simply rounded; middle tibiae with fringes of swimming-hairs.