Molluscan taxonomy: Classification and species diversity

Vidya, R and Dineshbabu, A P (2025) Molluscan taxonomy: Classification and species diversity. In: Course Manual:ICAR Sponsored Short course on Integrated Taxonomic techniques for Marine Biodiversity Conservation. CMFRI Training Manual Series (48). ICAR- Central Marine Fisheries Research Institute, Kochi, pp. 208-233.

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Abstract

The molluscs belong to the large and diverse phylum Mollusca, which includes a variety of familiar animals well-known as decorative shells or as seafood. These range from tiny snails, clams, and abalone to larger organisms such as squid, cuttlefish and the octopus. These molluscs occupy a variety of habitats ranging from mountain forests, freshwater to more than 10 km depth in the sea. They range in size from less than 1 mm to more than 15 m (for example the giant squid) and their population density may exceed 40,000/m2 in some areas. In the tropical marine environment, molluscs occupy every trophic level, from primary producers to top carnivores. India has extensive molluscan resources along her coasts. In the numerous bays, brackish waters and estuaries and in the seas around the subcontinent; molluscs belonging to different taxonomic groups, such as, mussels, oysters, clams, pearl-oysters, window-pane oysters, ark-shells, whelks, chanks, cowries, squids and cuttlefish have been exploited since time immemorial for food, pearls and shells.

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