Dasycerus poseidon Hu & Liang, 2021

Hashizume, Takuto & Maruyama, Munetoshi, 2022, Taxonomy and phylogeny of the Japanese species of the genus Dasycerus Brongniart (Coleoptera: Staphylinidae: Dasycerinae) with description of a new species and notes on D. poseidon Hu & Liang, Zootaxa 5174 (3), pp. 233-246 : 241-242

Dasycerus poseidon Hu & Liang, 2021

( Fig. 5 )

Dasycerus poseidon Hu & Liang, 2021: 244 (original description; type locality: Taiwan, Nantou County, Guando Mt. (MD山), Puli To., 24.0217, 121.0103, ca. 1582 m,).

Specimen examined. Taiwan: Nantou County: 5 exs., Guando Mt. , 8 VII 2021, Y.-H. Ho leg. ( KUM). 4+ exs., alt. 1800 m, Nandongyan Shan, 13 X 2015, M. Tanaka leg. ( KUM) .

Additional description. Female genital chamber ( Fig. 5F ) membranous and short, without spines on surface. Distal gonocoxite has about 10 preapical setae. Gonostylus has one seta as long as gonostylus at the apex and shorter preapical setae.

Distribution. Taiwan.

Remarks. In the original description, this species was described as lacking a protergosternal keel ( Hu & Liang, 2021), but a specimen identified as this species based on its morphological characters, including its aedeagus, had a keel visible in transmitted light ( Fig. 5C ). The female genital chamber ( Fig. 5E ) is membranous and shorter than that of D. japonicus . Median groove of pronotum is relatively short (0.36–0.40 times as long as pronotum) [ Fig. 5A (modified from Hu & Liang (2021))]. Punctures of the elytron are relatively small and roughly ovoid ( Fig. 5E ).

Figures

FIGURE 5. Dasycerus poseidon. (A) Pronotum in dorsal view (modified from Hu & Liang (2021)). (B–C) Prothorax in ventral view (white triangles indicate the protergosternal keel). (D–E) Right elytron in dorsolateral view. (F) Female genital chamber in ventral view. Scale bars: 0.2 mm for A & F; 0.5 mm for B & D.