An extinct group of marine fish-like or porpoise-like reptiles abundant in Mesozoic seas.

This marine reptile lived during the middle Triassic Period and throughout the Cretaceous Period. They ranged in size from 1–10 metres in length. These reptiles had numerous sharp teeth and fed primarily on fish.

any of several marine reptiles of the Mesozoic having a body like a porpoise with dorsal and tail fins and paddle-shaped limbs

an extinct marine reptile that gave birth to live young

'Fish Reptile'. A type of marine reptile that resembles a dolphin or a shark.

Mesozoic marine reptile which bears a superficial resemblance to a modern dolphin.

Ichthyosaurs were prehistoric reptiles that lived in the sea.

Ichthyosaurs (Greek for 'fish lizard' - ιχθυς meaning 'fish' and σαυρος meaning 'lizard') were giant marine reptiles that resembled fish and dolphins. Ichthyosaurs lived during a large part of the Mesozoic era, having appeared about 250 million years ago (Mya), slightly earlier than the dinosaurs (230 Mya); and disappeared about 90 Mya, about 25 million years before the dinosaurs became extinct. During the middle Triassic Period, ichthyosaurs evolved from as-yet unidentified land reptiles that moved back into the water, in a development parallel to that of modern-day dolphins and whales.