* Phestilla fuscostriata Hu, Zhang, Xie & Qiu, 2020 Figure 20L

Material examined.

Two specimens 11-15 mm, SRB; one specimen 12 mm, HF; one specimen 18 mm, LT.

Ecology.

Exclusively on its prey, the scleractinian coral Pavona decussata Dana, 1846, which is abundant throughout the depth range of coral reefs around Koh Tao. Depth 1-19 m.

Distribution.

Phestilla fuscostriata was previously known only from Hong Kong (Hu et al. 2020). Here we record it for the first time from Thai waters.