The maxima clam (Tridacna maxima), also known as the small giant clam, is a species of bivalve mollusc found throughout the Indo-Pacific region. They are much sought after in the aquarium trade, as their often striking coloration mimics that of the true giant clam; however, the maximas maintain a manageable size, with the shells of large specimens typically not exceeding 20 centimetres (7. 9 in) in length.
Tridacna maxima. Retrieved May, 22 2023, from en.wikipedia.org/wiki/Maxima_clam.