Ancient freshwater crustaceans with three eyes.

Triops cancriformis, European tadpole shrimp or tadpole shrimp is a species of tadpole shrimp found in Europe to the Middle East and India.

(commonly called American tadpole shrimp or longtail tadpole shrimp) a freshwater crustacean of the order Notostraca, resembling a miniature horseshoe crab.

Triops australiensis, sometimes referred to as a shield shrimp, is an Australian species of the tadpole shrimp Triops.