Stenopterygiidae are a family of the

Ichthyosauria 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. Ichthyosaurians thrived during much of the Mesozoic era; based on foss ...

, a group of extinct marine reptiles that superficially resemble fish. They are distinguished from other ichthyosaurs by the arrangement of the flipper bones and by the broad attachment of the fins to the body.

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