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Chacaiosaurus
Pliosaur
A Maresurus with a Chacaiosaurus clenched in its jaws

Kingdom:

Animalia

Phylum:

Chordata

Class:

Reptilia

Order:

†Icthyosauria

Family:

†Stenopterygiidae

Genus:

†Chacaicosaurus

Species:

†C. cayi (type)

Chacaiosaurus was a genus of Stenopterygiidae ichthyosaur from the Bajocian stage of the Middle Jurassic. Fossils indicate that it lived in what is today Argentina. Like most ichthyosaurs, Chacaiosaurus had a dauphin shaped body with a long, narrow snout. This genus also had had a prominent dorsal fin and a shark-like caudal fin. Chacaiosaurus, like its closest relative Stenopterygius, was probably viviparous, meaning it gave live birth.