Grouvellinus Champion, 1923

Bian, Dongju & Zhang, Yi, 2023, Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae), Zootaxa 5254 (2), pp. 257-277 : 257-258

Genus Grouvellinus Champion

Diagnosis. Body obovate, elongated obovate or broadly obovate, well convex dorsally.Antennae short, 11 segmented. The first segment slightly swollen, the second segment distinctly elongated and swollen, the third segment small basally and distinctly swollen towards apical part, the 4 th to 8 th segments small and short, last 3 antennomeres distinctly enlarged, forming a loose club. Most species without median impression or carina on pronotum, only one species Grouvellinus carus with an oval median discal impression, and some species with a median carina (see Bian & Jäch 2019); with a pair of sublateral carinae (in some species, sublateral carinae vestigial, not distinctly carinate). Elytra subparallel in basal 2/3, distal 1/3 slightly or distinctly attenuated in most species (In Grouvellinus spnaericus sp. n., elytra subparallel in basal half, and distinctly attenuated in distal half.). Elytral intervals 7, 8 or 5, 7, 8, or 3, 5, 7, 8 carinate. Protibia with medio-apical fringe of setae. Penis with developed apophyses, in most species, the apophyses of the penis reaching the base of the phallobase; in the other species, the apophyses of penis at least reaching the basal half of the phallobase.

Distribution. China, India, Indonesia, Korea, Malaysia, Myanmar, Nepal, Vietnam, Japan.