(Fig. 17)
Polyonyx triunguiculatus Zehntner, 1894: 185.— Lewinsohn 1969: 158, figs. 35 a–h.— Haig 1979: 133, figs. 23–25.— Johnson 1970: 36.— Haig 1983: 286; 1989: 99.— Yang 1996: 262, fig. 4.— Yang & Naiyanetr 1997: 6, figs. 3 A–E.— Komai 2000: 367.
Material examined. 1 ɗ (SMF 25676), Red Sea, Sudan, Sanganeb Atoll, 2 Oct. 1992, S-Jetty, 30 m, dead corals, SAN 110; 1 ɗ (ZMB), Red Sea; 1 ɗ, 1 Ψ (SMF 25677) Sudan, Red Sea Province, Sanganeb-Atoll 28 km NE Port Sudan, S-Mole, SAN-114, 50 m, from dead Stylophora, 25 Sep. 1992, leg V. Neumann.
Measurements. Largest ɗ 2.4 x 2.9 mm; largest Ψ 3.0 x 3.6 mm.
Distribution. Indian Ocean from Madagascar to Western Australia, including the Red Sea, and in the western Pacific eastwards to the Moluccas.