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An ark shell is a member of the family Arcidae of saltwater clams or marine bivalve molluscs.
The limpet has only one shell, making it a univalve. Molluscs with two shells, such as clams and mussels, are bivalves.
a bivalve
a bivalve
a bivalve
snails...
The beak of the bivalve shell.
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Nematodes MolluscsLongitudinal musclesMuscular footPseudocoelomatesCoelomatesnever has shell some has shell
A "bivalve" is a mollusk that has a hinged shell divided into two halves or "valves," such as clams, oysters, and mussels.
Ligament, But it not closed by a ligament it is closed by a muscle
no some molluscs dont have shells eg slug