Stenopterygiidae

{{Short description|Extinct genus of marine reptiles}}

{{Automatic taxobox

| fossil_range =
Early Jurassic, {{Fossil range|183|179|latest=Bajocian}}Possible Middle Jurassic record

| image = Image from page 123 of "Water reptiles of the past and present" (1914) (14586307740).jpg

| image_caption = Stenopterygius quadriscissus fossil preserving soft tissue envelope

| taxon = Stenopterygiidae

| authority = Jaekel, 1904

| subdivision_ranks = Genera

| subdivision =

• {{extinct}}Chacaicosaurus?
• {{extinct}}Magnipterygius{{cite journal |last1=W. Maisch |first1=Michael |last2=T. Matzke |first2=Andreas |title=Magnipterygius huenei n. gen. n. sp., a new small stenopterygiid (Reptilia: Ichthyosauria) from the Posidonienschiefer Formation of SW Germany |journal=Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen |date=2022 |volume=303 |issue=2 |pages=169–201 |doi=10.1127/njgpa/2022/1042 |s2cid=246797718 |url=https://www.researchgate.net/publication/358495106 |access-date=10 February 2022}}
• {{extinct}}Stenopterygius

}}

Stenopterygiidae are a family of the Ichthyosauria, 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.