Neosteneosaurus

{{short description|Genus of reptiles (fossil)}}

{{Speciesbox

| fossil_range = Callovian-Oxfordian
~{{fossilrange|165|158}}

| image = Neosteneosaurus.png

| image_caption = Holotype and assigned specimen

| display_parents = 2

| parent_authority = Johnson et al., 2020

| taxon = Neosteneosaurus edwardsi

| authority = (Eudes-Deslongchamps, 1868)

| synonyms =

• Steneosaurus dubroviensis
• Steneosaurus edwardsi Eudes-Deslongchamps, 1868
• Steneosaurus hulkei Andrews, 1913

}}

File:Neosteneosaurus side.jpg]]

Neosteneosaurus is a genus of machimosaurid, known from the Middle Jurassic Oxford Clay of the UK, and Marnes de Dives, France. The type species, N. edwardsi, was originally named as a species of Steneosaurus in 1868,Eudes-Deslongchamps E. 1867-1869. Notes Paléontologiques. Caen and Paris: 320-392. but was moved to its own genus in 2020. Steneosaurus durobrivensis and Steneosaurus hulkei are considered junior synonyms.{{cite journal |last1=Johnson |first1=Michela M. |last2=Young |first2=Mark T. |last3=Brusatte |first3=Stephen L. |title=The phylogenetics of Teleosauroidea (Crocodylomorpha, Thalattosuchia) and implications for their ecology and evolution |journal=PeerJ |date=2020 |volume=8 |pages=e9808 |doi=10.7717/peerj.9808|pmid=33083104 |pmc=7548081 |doi-access=free }}

In 2015, it was estimated at more than {{cvt|7|m}} in length.{{cite journal|author=Michela M Johnson, Mark Thomas Young, Lorna Steel, Yves Lepage|url=https://www.researchgate.net/publication/280098383|title=Steneosaurus edwardsi (Thalattosuchia: Teleosauridae), the largest known crocodylomorph of the Middle Jurassic|journal=Biological Journal of the Linnean Society|date=July 2015|volume=115|issue=4|pages=911–918|doi=10.1111/bij.12525|doi-access=free}} In 2016, this estimate was revised down to {{cvt|6.6|m|ft}}, but even with such measurement, this animal remains to be the largest known Middle Jurassic crocodylomorph.{{Cite journal|url=http://palaeo-electronica.org/content/2016/1554-teleosaurid-size-estimation|doi=10.26879/648|title=Big-headed marine crocodyliforms and why we must be cautious when using extant species as body length proxies for long-extinct relatives|year=2016|last1=Young|first1=MT|last2=Rabi|first2=M.|last3=Bell|first3=MA|last4=Foffa|first4=D.|last5=Steel|first5=L.|last6=Sachs|first6=S.|last7=Peyer|first7=K.|journal=Palaeontologia Electronica|volume=19|issue=3|pages=1–14|doi-access=free}}