Growth ring Northern hard clam, Mercenaria mercenaria There are over 15,000 different species of clams worldwide. Vnt l lVentral or lower 6. Dorsal or upper 5. Anatomy and Diet: Clams come in many colors, including shades of brown, red-brown, yellow, cream, etc. Grows to a maximum length of 1.5 meters (4 ft.).
The biggest clam is the Giant Clam, Tridacna gigas; it is up to 4.8 feet (1.5 m) long and weighs up to 550 pounds (250 kg). Anterior or head 3. The common hardshell clam Mercenaria mercenaria, better known as a cherrystone, has a mouth, labial palps (antecedents of lips), a stomach, separate digestive gland, an intestine, nerve cord and an anus. Economic Importance for Humans: Negative. Pi liPosterior or tail 4.

Farmed giant clams are also sold for food (the adductor muscle is considered a delicacy) and for the aquarium trade. The giant clam is the largest immobile mollusc in the world, with the occasional giant clam individual reaching nearly 6ft in length. The world's first geoduck fishery was created in 1970, but demand for the half-forgotten clam was low at first due to its texture. Giant Clam Tridacna gigas. Despite their classic movie depictions as "killer clams," there are no authentic cases of people being trapped and drowned by giant clams. that large giant clams can be very old. In fact, it is possible to determine the age of a giant clam by cutting a vertical section down through its shell to reveal annual growth lines, like those of a tree. It is not just age Figure 1. There is a bibliography and subject index. They have lots of iridescent spots all over the mantle, but more concentrated on the edges. The Giant Clam is usually blue, golden brown, yellow or green.
Their close relation to human anatomy is surprising – one can readily see the evolutionary underpinnings of H. sapiens. Young T. gigas are difficult to distinguish from other species of Tridacninae.Adult T. gigas are the only giant clams unable to close their shells completely. Left valve or shell 2.

Anatomy. A huge clam weighing near 500 kg was about 63 years old. Most clams are only a few inches long. There is some comparative anatomy of other species of giant clam (T. derasa, T. maxima, T. crocea, T. squamosa, T. tevoroa, Hippopus hippopus, H. porcellanus). The Giant Clam (Tridacna gigas) is the largest living bivalve mollusc. Burrowing or Crocus Clam Crocea Clam. Very large. Even when closed, part of the mantle is visible, unlike the very similar T. derasa.However, this can only be … Giant Clams •Tridacna derasa –Second largest species of giant clam –Shell length to 60 cm –Valves heavy and very thick at umbos –Valve margins undulate with 6-7 rounded extremities of rib interstices –Byssal orifice narrow and short and hinge line usually longer than half the shell length Australian National Parks and Wildlife Service This atlas contains black and white drawings and photographs of the giant clam (Tridacna gigas) currently used in mariculture in the Indo-Pacific region. Umbo (“beak”) • Oldest part of the shell 7. Giant clams: benign giants. External Clam Shell Anatomy 1.


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