As in Saccostrea cucullata, Saccostrea is considered to be the common oyster of Indo-Pacific shores. A chaotic taxonomy of the genus has, however, resulted from morphological plasticity among ecotypes. Some Saccostrea "forms" have been cross-referred to by different names by different authors. For example S. commercialis has been regarded as subspecies of S. cucullata due to similar chell characteristics. Torigoe (1981) updated the controversy related to Saccostrea taxonomy and concluded that S. commercialis is a synonym of S. glomerata, different from S. cucullata. However, the differences are apparent only at the molecular level.
blue black to grey-white and blue-black or purple margins. Internally chalky white with purple areas and black-purple or brown margins.
common size :
in Australia length to 100 mm (cultivated specimens up to 255 mm).
Based on molecular biology studies of S. commercialis in eastern Australia and S. cucullata in western Australia and Hong Kong, these can be regarded as different species in terms of DNA 16S sequences (Lam and Morton, 2001).
BIOLOGY / ECOLOGY
Epifaunal, suspension feeder, lives cemented to rocks/hard substrata.
attached to rocks in subtidal areas.