Coelostoma

Liu, Hsing-Che, Hu, Fang-Shuo & Fikáček, Martin, 2020, Review of the genus Coelostoma of Taiwan with description of a new species (Coleoptera: Hydrophilidae), Acta Entomologica Musei Nationalis Pragae 60 (1), pp. 155-162 : 156

Coelostoma Brullé, 1835

Diagnosis. The genus can be distinguished from other hydrophilid genera occurring in Taiwan by the following combination of characters: body rather convex, brown to black (Fig. 1); eyes of moderate size, deeply excised internally; antenna with 9 antennomeres, antennal club loosely segmented; mesoventrite with arrow-head shaped median elevation; metaventrite longer than mesoventral elevation, with strongly raised median portion broadly projecting anteriorly and abutted to mesoventral process; elytra lacking serial punctures; sutural stria reaching basal half of elytra.

Bionomics. All species inhabit moist environments, typically being found on gravely, sandy or muddy shores of rivers and pools. Some species live directly in shallow vegetated standing water (FIKÁČEK et al. 2019) and others are found on seepages and wet rocks with algae ( JIA et al. 2014).