Anomia ephippium is a species of bivalve mollusk, also known as the saddle oyster. It belongs to the family Anomiidae and is known for its large, flat, and triangular-shaped shells. This species is often found in warm waters and can be identified by its distinctive ridge, which resembles a saddle. In terms of synonyms, this species is commonly referred to as the saddle clam, saddle shell, or saddle cockle. These synonyms are used as an alternative to the scientific name and help to avoid confusion when referencing this mollusk. Overall, the saddle oyster is an interesting species with unique characteristics and is a valuable addition to marine ecosystems.