Definition of tusk shell in English:

tusk shell

noun

  • another term for tooth shell
    • ‘The nervous system of mollusks varies greatly from group to group; the clams and tusk shells have very simple nervous systems, while the squids, octopuses and some other mollusks have concentrated complex nerve centers and eyes equivalent to vertebrates.’
    • ‘There are approximately 900 species of Scaphopoda, commonly called tusk shells.’
    • ‘The Scaphopoda are a distinctive group of molluscs commonly known as the ‘tusk shells’ because their shells are conical and slightly curved to the dorsal side, making the shells look like tiny tusks.’
    • ‘In bivalves, chitons, tusk shells and some snails, sperm and eggs are released into the water and fertilisation is external.’
    • ‘The phylum Mollusca also ‘includes lesser known forms such as the chitons, tusk shells, and solenogasters, among others’.’