Chione Amathusia Clam Shell, Chione amathusia: The Chione Clam Amathusia has a ovate egg-shaped shell that is porcelain-like that is highly finished and it lacks spines.
The shell's large primary ribs are interspersed by fine secondary ribs.
They reach a maximum size of 12 cm (5 inches) and are found over and within sand bottoms well off shore.
In Mexico, they are found throughout the Sea of Cortez and along the coast of the mainland south to Guatemala. They are a by-catch of deep water shrimp trawlers.
This is a member of the Vereridae family, which are known as Venus Clams. They are bivalve mollusks, most of which are edible with many being exploited as a food source. The family is very large and consists of very small to very large salt water species with approximately 500 known global members to the family.
Its most famous member is the Quahog or Hard Clam, Mercenaria mercenaria, found along the Atlantic Seaboard from Prince Edward Island to the Yucatán.
The Venerid clams are characterized as bivalves with an external posterior ligament, usually a well demarcated anterior area known as the lunule, and three interlocking structures (called cardinal teeth) in the top of each valve. The inner lower peripheries of the valves can be finely toothed or smooth. The Venus Clams are considered by many conchologist to be some of the most beautiful bivalve clams.