A new species of Tridacna giant clam has been discovered in the Red Sea. Formerly believed to be a variant of Tridacna maxima, the newly described T. costata is now considered to be under serious threat of extinction. The new Tridacnid was found to make up less than one percent of the giant clam population in the Red Sea and although it was once widespread, overharvesting by humans is thought to be one of the main causes of its decline. T. costata is distinguished from T. maxima by more numerous and distinct rib-like folds of the shell as well as a subdued brownish mantle which exhibits numerous, wart-like protrusions. Although the clam has only been identified from the Red Sea, it is quite possible that this species occurs outside of this range and that it has been mistaken for a brown T. maxima all this time. Keep your eyes peeled at the LFS and let us know if you find one.