* Philine orca (Pease, 1860) Figure 8D

Material examined.

Two individuals 2-4 mm, CB; one individual 3 mm, SB.

Ecology.

Observed exclusively under dead Fungiidae coral skeletons where it is extremely cryptic, although it may be abundant. The only cephalaspidean species recorded exclusively from the coral reef habitat at Koh Tao. Depth 3-8 m.

Distribution.

Widespread across the Indo-Pacific including Japan (Baba 1990), Australia (Nimbs and Smith 2016), Madagascar, Malaysia, the Philippines, Indonesia, Papua New Guinea, Hawaii, and the Galapagos Islands (Gosliner et al. 2008). Here documented as a first record for Thai waters.