Arkyidae

Arkyidae is a family of small to medium-sized sea snails, marine gastropod mollusks in the superfamily Arcoida, order Arcida. These bivalves are commonly known as ark clams or ark shells.

Characteristics:

Ark clams are characterized by their thick, trapezoidal or oblong shells, which are often ribbed. The hinge line is straight and elongated, with numerous small, transverse teeth. A thick, hairy periostracum (outer protein layer) typically covers the shell. The shell itself is usually white or cream-colored. The foot is relatively small and is used for limited movement or anchoring. They are filter feeders, extracting food particles from the water.

Distribution:

Ark clams are found in tropical and temperate waters worldwide. They inhabit a variety of substrates, including sand, mud, and rock.

Classification:

The classification of Arkyidae has undergone revisions over time. It is currently recognized as a family within the order Arcida. Genera within the family can vary based on different taxonomic schemes.

Relationship to Humans:

Some species of ark clams are commercially harvested for food in certain regions. They are also sometimes collected for their shells.