| Chacaiosaurus | |
|---|---|
 A Maresurus with a Chacaiosaurus clenched in its jaws | |
|
Kingdom: |
Animalia |
|
Phylum: |
Chordata |
|
Class: |
Reptilia |
|
Order: |
†Icthyosauria |
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Family: |
†Stenopterygiidae |
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Genus: |
†Chacaicosaurus |
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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 Stenopterygiust, was probably viviparous, meaning it gave live birth.