Rheotanytarsus tamaquartus Sasa

Sasa 1980: 16 (Fig. 11), Wang & Zheng 1993: 89 (Figs. 1–2), Kyerematen, Andersen & Saether 2000: 238 (Figs 3 A–D)

Rheotanytarsus tamaquartus Sasa is described in detail by Wang & Zheng (1993).

Diagnostic characters. This species of the guineensis group is characterized by having the gonostylus abruptly tapered in the apical 1/5, anal point slender, parallel­sided and with rounded apex, no anal crests, and median volsella with a large plate and overreaching the superior volsella.

Distribution. The species is known from Japan and Guangdong Province of China.