Epimetopidae

Fikáček, Martin, Matsumoto, Keita, Perkins, Philip, Prokin, Alexander, Sazhnev, Alexey, Litovkin, Stanislav & Jäch, Manfred A., 2021, The family Epimetopidae (Coleoptera: Hydrophiloidea): review of current knowledge, genus-level phylogeny, and taxonomic revision of Eupotemus, Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 61 (1), pp. 1-34 : 16

Key to genera of Epimetopidae

1. Elytra with scutellary stria, odd intervals with series of elevated tubercles, never with keels ( Fig. 15). Pronotum without longitudinal keels ( Fig. 14). Aedeagus with very long curved conical phallobase and complex multilobate parameres ( Figs 6V–Z). Male sternite IX O-shaped ( Fig. 6U). Asia. ..................................... .............................. Eumetopus Balfour-Browne, 1949

– Elytra without scutellary stria, odd intervals with longitudinal keels which may be interrupted here and there ( Figs 9, 10, 12, 16). Pronotum with longitudinal keels ( Figs 9, 10, 12, 16). Aedeagus with simple flat open phallobase and simple parameres ( Figs 6D–H, L–R). Male sternite IX U- or V-shaped ( Figs 6C, K). Africa and America. .................................................... 2

2. Procoxal cavities open posteriorly ( Fig. 3A). Male sternite IX V-shaped ( Fig. 6C). Median lobe with a single ventral projection which is simple or bifid at apex ( Figs 6G–H). Africa. .............................................. ........................................... Eupotemus Ji & Jäch, 1998

– Procoxal cavities closed posteriorly ( Figs 3G, I). Male sternite IX U-shaped ( Fig. 6K). Median lobe either without any projections, or with a pair of projections ( Figs 6L–R). America. .................................................... ...................................... Epimetopus Lacordaire, 1854