Last updated: October 9, 2017 at 18:08 pm
Giant clam (Tridacna gigas). A specimen at the American Museum of Natural History measures close to 140 cm (55 in.). Another was found off Okinawa, Japan (1956) measuring 115 cm (45.25 in.) and weighing 333 kg (734 lbs.). The giant clam is also the heaviest clam.
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Jeffrey Gallant is the Editor-in-Chief and Records Keeper of the Diving Almanac. He is also a contributing editor of DIVER Magazine, and the scientific director of the Greenland Shark and Elasmobranch Education and Research Group (GEERG). Jeffrey started diving in 1982.