👉 Diphterostomum is a type of crustacean, commonly known as snail or oyster. It belongs to the family Daphnia and is characterized by its elongated body with six pairs of arms that are typically arranged in two rows. These arms can be large or small, but they all have a similar shape. The snails are sessile (dipentodontid) and do not possess a gill. They feed on small animals such as crustace