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Bivalvia (/ b aɪ ˈ v æ l v i ə /) or bivalves, in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of aquatic molluscs (marine and freshwater) that have laterally compressed soft bodies enclosed by a calcified exoskeleton consisting of a hinged pair of half-shells known as valves.
A bivalve shell is the enveloping exoskeleton or shell of a bivalve mollusc, composed of two hinged halves or valves. The two half-shells, called the "right valve" and "left valve", are joined by a ligament and usually articulate with one another using structures known as "teeth" which are situated along the hinge line .
Anomia simplex is a typical species of bivalve mollusk in the family of Anomiidae, similar to blue mussels, American oysters, and bay scallops. [1] The family of Anomiidae ranges from saltwater clams to bivalve mollusks, which contains about 7 genera, including Anomia simplex.
Diagram of the internal shell structure of the left valve of bivalve resembling a venerid in which the pallial line is shown. The pallial line is a mark (a line) on the interior of each valve of the shell of a bivalve mollusk. This line shows where all of the mantle muscles were attached in life.
Bivalve molluscs are used as bioindicators to monitor the health of aquatic environments in both fresh water and the marine environments. Their population status or structure, physiology, behaviour or the level of contamination with elements or compounds can indicate the state of contamination status of the ecosystem.
Bivalves that can withdraw the siphons into the shell have a "pallial sinus", a sort of pocket, into which the siphons can fit when they are withdrawn, so that the two shell valves can close properly. The existence of this pocket shows even in an empty shell, as a visible indentation in the pallial line, a line which runs along parallel to the ...
Turns out they are the only bivalve mollusk that actually does swim. Ocean Conservatory explains more, "Sea scallops can swim by quickly opening and closing their shells, allowing them to escape ...
Diagram of Trigonia costata James Parkinson, ... Trigonia is an extinct genus of saltwater clams, fossil marine bivalve mollusk in the family Trigoniidae.