Phylum Mollusca represents one of the most diverse and ecologically significant groups within the animal kingdom. Characterised by their soft bodies, often protected by a calcareous shell, molluscs exhibit remarkable variation in form (shape), habitat, and behaviour. Molluscs are the second largest group of animals after arthropods in terms of number of species described. They are traditionally classified into seven classes: Gastropoda (snails and slugs), Bivalvia (clams, mussels, and oysters), Cephalopoda (squids, octopuses, and cuttlefish), Polyplacophora (chitons), Scaphopoda (tusk shells), Monoplacophora (a rare class of deep-sea molluscs), and Aplacophora (worm-like, shell-less molluscs). Currently, 86,436 species of molluscs (extant species) are described from marine, freshwater and terrestrial habitats. The highest diversity of molluscs is reported from marine environments, with 51,212 species, followed by terrestrial (28,536 species) and freshwater (6,688 species) (MolluscaBase 2023).