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The adult maximum size of living species of bivalve ranges from 0.52 mm (0.02 in) in Condylonucula maya, [61] a nut clam, to a length of 1,532 millimetres (60.3 in) in Kuphus polythalamia, an elongated, burrowing shipworm. [62]
Freshwater bivalve species vary greatly in size. Some pea clams (genus Pisidium) have an adult size of only 3 mm (0.12 in). In contrast, one of the largest species of freshwater bivalves is the swan mussel from the family Unionidae; it can grow to a length of 20 cm (7.9 in), and usually lives in lakes or slow-flowing rivers.
The Registry of World Record Size Shells is a conchological work listing the largest (and in some cases smallest) verified shell specimens of various marine molluscan taxa.A successor to the earlier World Size Records of Robert J. L. Wagner and R. Tucker Abbott, it has been published on a semi-regular basis since 1997, changing ownership and publisher a number of times.
The main reason that giant clams are becoming endangered is likely to be intensive exploitation by bivalve fishers. Mainly large adults are killed because they are the most profitable. [6]: 33 A giant clam from East Timor of more than one meter in length
Clam is a common name for several kinds of bivalve mollusc. The word is often applied only to those that are edible and live as infauna, spending most of their lives halfway buried in the sand of the sea floor or riverbeds. Clams have two shells of equal size connected by two adductor muscles and have a powerful burrowing foot. [1]
In many bivalve shells, the two valves are symmetrical along the hinge line — when truly symmetrical, such an animal is said to be equivalved; if the valves vary from each other in size or shape, inequivalved. If symmetrical front-to-back, the valves are said to be equilateral, and are otherwise considered inequilateral.
It is one of the most commonly found species of bivalves in the western Atlantic Ocean. [1] Able to reach sizes between 7.9 and 8.9 inches (20 and 23 cm) in length, Atlantic surf clams are much larger than Spisula solida , which also resides in the eastern Atlantic coastal waters.
An Eocene species Superlucina megameris was the largest lucinid ever recorded, with shell size up to 31.1 centimetres (12.2 in) high, over 28 centimetres (11 in) wide and 8.6 centimetres (3.4 in) thick. [3]