Molluscs are probably the most diverse group of marine animals. They are present in most marine habitats from the highest intertidal zone to the deep abyss as well as inhabiting the oceanic water column. Living molluscs are divided into a number of major groups (Classes) namely; Gastropoda, Bivalvia, Polyplacophora, Scaphopoda, Cephalopoda, Monoplacophora and Aplacophora. Of these, the gastropods and the bivalves are by far the most species-rich groups and the most frequently encountered in intertidal and shallow water habitats.
References
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