Derisemias Jordan , 1928: 86

Imada, Shunsuke, 2019, Two new species of the genus Derisemias Jordan (Coleoptera, Anthribidae) from Japan and Taiwan, Zootaxa 4629 (1), pp. 69-76 : 70

Genus Derisemias Jordan, 1928: 86

Type species: Derisemias picticollis Jordan, 1928: 86 , by original designation .

Diagnosis. The genus Derisemias is distinguished from other oriental anthribid genera by the lateral prothoracic carinae reaching anterior margin, hind angle of pronotum being acute, transverse prothoracic carina touches into anterior margin of elytra and pronotal disc being with two pairs of tufts ( Jordan 1928; Morimoto 1972). This genus is similar to Tophoderes Dejean, 1834 and Tophoderellus Wolfrum, 1959 known from Madagascar but distinguished from them by the following character states: rostrum short, without conspicuous carina, hind angle of pronotum being clearly acute, transverse prothoracic carina touches anterior margins of elytra, pronotal disc with two pairs of tufts, and small body.

Comments. Only three species are described based on both sexes, so the extent of sexual dimorphism is poorly known in this genus. However, for an African species, Wolfrum (1959) reported that the male anal segment has a margined double pit, filled with hairs. The new species agree well with this male character state ( Figs. 9–10 ).

Figures

FIGURES 9–10. Ventral habitus of Derisemias species: 9. D. tsutsumiuchii sp. nov. 10. D. kojimai sp. nov. Scale bar: 2.0 mm.