n.shrimp-like crustaceans whose females carry eggs and young in a pouch between the legs
英汉双解大词典
opossum shrimp
1.
N（名词）
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 糠虾