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13-Sep-2017 21:51

The anterior or front of the shell is where the byssus (when present) and foot are located, and the posterior of the shell is where the siphons are located.

With the umbones/ hinge uppermost and with the anterior edge of the animal towards the viewer's left, the valve facing the viewer is the left valve and the opposing valve the right.

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In bivalves, the mantle lobes secrete the valves, and the mantle crest secretes the whole hinge mechanism consisting of ligament, byssus threads (where present), and teeth.

Modern knowledge of molluscan reproductive cycles has led to the development of hatcheries and new culture techniques.

A better understanding of the potential hazards of eating raw or undercooked shellfish has led to improved storage and processing.

The shell is typically bilaterally symmetrical, with the hinge lying in the sagittal plane.

Adult shell sizes of bivalves vary from fractions of a millimetre to over a metre in length, but the majority of species do not exceed 10 cm (4 in).

In bivalves, the mantle lobes secrete the valves, and the mantle crest secretes the whole hinge mechanism consisting of ligament, byssus threads (where present), and teeth.Modern knowledge of molluscan reproductive cycles has led to the development of hatcheries and new culture techniques.A better understanding of the potential hazards of eating raw or undercooked shellfish has led to improved storage and processing.The shell is typically bilaterally symmetrical, with the hinge lying in the sagittal plane.Adult shell sizes of bivalves vary from fractions of a millimetre to over a metre in length, but the majority of species do not exceed 10 cm (4 in).The umbo generally and the beak specifically represent the oldest portion of the shell, with extra material gradually being laid down along the margins on the opposite sides.