Goniobranchus sp. Figure 10H

Material examined.

One specimen 55 mm, CP.

Ecology.

Among rocks and corals at offshore rocky pinnacles. Depth 18 m.

Distribution.

Goniobranchus sp. 5 (Soong et al. 2020) is known from the Philippines, Indonesia, Japan, and Australia. A similar species is known from the Gulf of Thailand, incorrectly recorded as Goniobranchus reticulatus by Mehrotra and Scott (2016).

Remarks.

Red reticulated specimens of Goniobranchus have been known to represent a complex of species often attributed to G. reticulatus or G. tinctorius . Recent molecular work by Soong et al. (2020) concluded that none of the five distinct lineages identified corresponded exactly with the description of either of the aforementioned species. Due to the overlapping ranges and external variability of some of these, a further morphological investigation into these lineages is needed to define the species.