Ichthyosauria
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Ichthyosauria is an order of large extinct marine reptiles sometimes referred to as "ichthyosaurs", although the term is also used for wider clades in which the order resides.
Ichthyosauria
An ichthyosaur and plesiosaur by Édouard Riou, 1863. This old representation of a plesiosaur lifting its head is not accurate and physically impossible.
The skull of specimen NHMUK PV R1158 found by Joseph Anning in 1811
The torso of specimen NHMUK PV R1158 found by Mary Anning in 1812
Marine reptile
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Marine reptiles are reptiles which have become secondarily adapted for an aquatic or semiaquatic life in a marine environment. Only about 100 of the 12,000 extant reptile species and subspecies are classed as marine reptiles, including marine iguanas, sea snakes, sea turtles, and saltwater crocodiles.
Reptiles that live in the sea: • Saltwater crocodile (top left) • Sea turtle (top right) • Marine iguana (bottom left) • Sea snake (bottom right)
Hawksbill sea turtle (Eretmochelys imbricata)
Fossil of Ophthalmosaurus icenius, a species of ichthyosaur