Freshwater Macroinvertebrates in Hong Kong

Cercyon sp.1

Family: Hydrophilidae
Subfamily: Sphaeridiinae
Tribe: Megasternini

Habitat: Wetland

General appearance: Small size. Elytra with 10 punctated striae. Antennae 9-segmented with club. Pronotum finely punctated. Prosternal process with a small notch apically. Prosternum tectiform with well defined antennae grooves. Middle and hind tibia flattened without pubescence. Mesosternal plates elongated oval.

Fullview
Cranium and pronotum (dorsal view)
Head in ventral view
Hind coxal process

 

Reference:
Hansen, M. (1991). The hydrophiloid beetles: phylogeny, classification and a revision of the genera (Coleoptera, Hydrophiloidea) (Vol. 40). Kgl. Danske Videnskabernes Selskab.