opossum shrimp

noun

1. any small, shrimplike crustacean of the order Mysidacea, the females of which carry their eggs in a pouch between the legs.

noun

1. any of various shrimplike crustaceans of the genera Mysis, Praunus, etc, of the order Mysidacea, in which the females carry the eggs and young around in a ventral brood pouch