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  2. Mollusc shell - Wikipedia

    en.wikipedia.org/wiki/Mollusc_shell

    The mollusc (or mollusk [spelling 1]) shell is typically a calcareous exoskeleton which encloses, supports and protects the soft parts of an animal in the phylum Mollusca, which includes snails, clams, tusk shells, and several other classes. Not all shelled molluscs live in the sea; many live on the land and in freshwater.

  3. Siphon (mollusc) - Wikipedia

    en.wikipedia.org/wiki/Siphon_(mollusc)

    The internal anatomy is visible, including the paired siphons to the right. A siphon is an anatomical structure which is part of the body of aquatic molluscs in three classes: Gastropoda, Bivalvia and Cephalopoda (members of these classes include saltwater and freshwater snails, clams, octopus, squid and relatives).

  4. Ctenidium (mollusc) - Wikipedia

    en.wikipedia.org/wiki/Ctenidium_(mollusc)

    Certain molluscs, such as the bivalves, [2] possess paired ctenidia, but others, such as members of the Ampullariidae, [3] bear a single ctenidium. [4] [5] A ctenidium is shaped like a comb or a feather, with a central part from which many filaments or plate-like structures protrude, lined up in a row.

  5. Mantle (mollusc) - Wikipedia

    en.wikipedia.org/wiki/Mantle_(mollusc)

    In species where the shell is small compared to the size of the body, more of the mantle shows. Shell-less slugs have the mantle fully visible. The dorsal surface of the mantle is called the notum, while the ventral surface of the mantle is called the hyponotum. In the family Philomycidae, the mantle covers the whole back side of the body. [2]

  6. Mollusca - Wikipedia

    en.wikipedia.org/wiki/Mollusca

    Mollusca is a phylum of protostomic invertebrate animals, whose members are known as molluscs or mollusks [a] (/ ˈ m ɒ l ə s k s /). Around 76,000 extant species of molluscs are recognized, making it the second-largest animal phylum after Arthropoda. [5]

  7. Columella (gastropod) - Wikipedia

    en.wikipedia.org/wiki/Columella_(gastropod)

    The columellar muscles are equally used to bring the soft body out of the shell. During protraction and retraction, the muscle twists, shortens or elongates. In very large gastropods such as the queen conch ( Aliger gigas ) once the columellar muscles are cut with a knife, the soft parts of the animal fall out of the shell easily.

  8. Valve (mollusc) - Wikipedia

    en.wikipedia.org/wiki/Valve_(mollusc)

    Bivalve molluscs (e.g. clams and oysters) have a shell which is composed of two separate but articulating parts. Each one of these two parts is known as a "valve". The two valves are known as the "right valve" and the "left valve"; these are labeled with respect to the anterior end of the bivalve, when the umbones are facing upward.

  9. Aperture (mollusc) - Wikipedia

    en.wikipedia.org/wiki/Aperture_(mollusc)

    The aperture is an opening in certain kinds of mollusc shells: it is the main opening of the shell, where the head-foot part of the body of the animal emerges for locomotion, feeding, etc. The term aperture is used for the main opening in gastropod shells, scaphopod shells, and also for Nautilus and ammonite shells.

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