* Atys semistriatus Pease, 1860 Figure 6I

Material examined.

Two specimens 8-12 mm, LB.

Ecology.

Very similar to R. multistriata, with which it is often found. A possible prey species for the mantis shrimp Haptosquilla cf. nefanda (see ecology of Aliculastrum debilis). Depth 8-18 m.

Distribution.

Across the Indo-Pacific including Japan (Kuroda and Habe 1952), Madagascar, Malaysia, the Philippines, Papua New Guinea, Guam, Samoa (Gosliner et al. 2008), Indonesia, New Caledonia, Tahiti, Hawaii (Too et al. 2014), and the Red Sea (Heller and Thompson 1983; Yonow 2008). Here representing a first record for Thai waters.