Phyllidiella cf. pustulosa (Cuvier, 1804) Figure 15D

Material examined.

Two specimens 35-40 mm, TT; one specimen 35 mm, CB.

Ecology.

Abundant in coral reef habitats. Depth 3-30 m.

Distribution.

' Phyllidiella pustulosa ' is known from India (Apte 2009), the Red Sea, Indonesia, the Philippines, Japan, Papua New Guinea, Australia, Fiji (Brunckhorst 1993), Hawaii (Gosliner et al. 2008), both Andaman and Gulf waters of Thailand (Brunckhorst 1993; Chavanich et al. 2013), and an externally different morphotype referred to as ' Phyllidiella cf. pustulosa ' is known from Mozambique ( Tibiriçá et al. 2017).

Remarks.

Morphological and molecular work (Chang and Willan 2015; Stoffels et al. 2016) has indicated that P. pustulosa is composed of a number of cryptic species. Specimens recorded from Koh Tao externally look similar to those illustrated in Brunckhorst (1993: pl. 5E, F) and Stoffels et al. (2016: figs 11I, J, 12F, 13B) but dissimilar from specimens in Mozambique ( Tibiriçá et al. 2017: figs 20C, D).