Tridacna squamosina is a species of the Tridacna genus, the giant clams. These animals are bivalve mollusks belonging to the family Cardiidae identified by Sturany 1899. In 2008 Roa-Quiaoit, Kochzius, Jantzen, Zibdah & Richter identified what they believed was a new species of giant clam they called Tridacna costata, however in 2011 Markus Huber and Anita Eschner examined a collection of Rudolf Sturanys specimens, held in the Natural History Museum, Vienna, that had remained not properly identified for over 100 years and discovered it was actually Tridacna squamosina. The collection held seven syntypes were identified and Tridacna squamosina was accepted and Tridacna costata formally synonymized.