Stenopterygius was an ichthyosaur that lived during the early Jurassic period about 183–179 million years ago.

It was similar to Ichthyosaurus but it had a smaller skull and narrower flippers. Stenopterygius was about 3.15 m (10.3 ft) long.

Stenopterygius quadriscissus

Fossil of adult and juvenile Stenopterygius quadriscissus

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