About Hysteroconcha dione (Linnaeus, 1758)
Hysteroconcha dione is a rare bivalve species first described by Linnaeus in 1758. The shells of this species can reach approximately 72 millimeters, or 2.8 inches, in length. The entire shell is very pale or whitish pink, with a whitish interior. Its anterior end is broadly rounded, while its posterior end slopes gently. The surface of each valve has several sharp, concentric, prominent ribs. This species is unusual in that each valve's posterior slope has a double series of long, curved spines. A closely related species, Pitar lupanaria, occurs in the Eastern Pacific. This species is distributed in the Gulf of Mexico, ranging from eastern Mexico to the West Indies. It can also be found on the East Coast of Florida and the Florida Keys. It inhabits intertidal zones and moderately shallow waters.
