A small collection of gastropods and bivalves from the Anambas and Natuna Islands, South China Sea

Ninety-one species of gastropods and 43 species of bivalves were collected during a weeklong expedition to the Anambas and Natuna Islands in the South China Sea. The majority of specimens were from sheltered intertidal habitats including coral reefs, rocky shores and mangroves. SCUBA and bottom trawls augmented collecting efforts. Based on the number of localities where each species was collected, Nerita undata (Neritidae), Clypeomorus batillariaeformis (Cerithiidae), Thais distinguenda (Muricidae) and Thais squamosa (Muricidae) were the most common and widespread intertidal gastropods. The epibyssate Barbatia foliata (Arcidae) and the sand-dwelling intertidal Atactodea striata (Mesodesmatidae) were the most common and widespread bivalves based on the frequency of occurrence at each sampling site. Molluscs from subtidal soft bottom substrata and specialized habitats were poorly represented. Freshwater species were also largely lacking.

Reference : Tan, K.S. and W. W. Kastoro. 2004. Raffles Bulletin of Zoology, Supplement No. 11: 47 - 54

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