Saccostrea scyphophilla ( Péron & Lesueur, 1807 )

Saccostrea scyphophilla ( Péron & Lesueur, 1807) View in CoL

( Fig. 4G–I)

Habitat. Rocky shore.

Material examined. Site 2, Samaesan. Identified in the field as Saccostrea cuccullata ( Table 2).

Published Gulf of Thailand records. Reported as Saccostrea mordax ( Gould, 1850) by Kurozumi et al. (1989) and Yoosukh (2000).

Geographic range. Australia ( Western Australia to New South Wales), Japan, China, and Taiwan ( Lam & Morton, 2006). Sekino & Yamashita (2013) showed a S. cucullata seq ( AY038076 View Materials ) collected from Thailand was actually S. mordax , but S. mordax is considered to be a synonym of S. scyphophilla (MolluscaBase eds., 2024).

Remarks. There are numerous literature references of S. mordax on the more open Thai coastline on the Andaman Sea, but we could only find records in the Gulf of Thailand by Kurozumi et al. (1989) and Yoosukh (2000). We detected the species only on the rocky shore at Samaesan. Saccostrea mordax was originally described from Fiji. While there are GenBank sequences available for the species, there are none from the type locality. Huber (2010) discusses the taxonomic history of the species in detail. Saccostrea scyphophilla was described by Péron & Lesueur (1807) from Shark Bay, Western Australia, and Huber (2010) considers the species to be the same, with S. scyphophilla having priority. Our DNA sequences of specimens collected in Samaesan ( Fig. 3) match those of Snow et al. (2023) and Wells et al. (2024), so we consider the Thai species to be S. scyphophilla .