Tridacna squamosa color is usually brown with colored spots or wavy lines. Blue and green spotted are also seen. The shell is heavy and fairly symmetrical. Maximum size is approximately 12".The Squamosa Clam relies heavily on the photosynthesis of the algae growing in its mantle.The shell is symmetrical, and the matching growth pattern in its shell allows it to close together very tightly when it needs to.They prefer a sand bottom instead of rocky surfaces, and do not need as much light as T. maxima or T. crocea in the aquarium. It is an excellent "beginner" clam species.Another characteristic are the large scutes or plates on the shell. They are native to the Indo-Pacific coral reefs, and are found in deeper water of 50-65 feet.