Neosteneosaurus

Neosteneosaurus
Temporal range: Callovian-Oxfordian
~165–158 Ma
Holotype and assigned specimen
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Archosauria
Clade: Pseudosuchia
Clade: Crocodylomorpha
Clade: Crocodyliformes
Suborder: †Thalattosuchia
Family: †Machimosauridae
Subfamily: †Machimosaurinae
Genus: †Neosteneosaurus
Johnson et al., 2020
Species:
†N. edwardsi
Binomial name
†Neosteneosaurus edwardsi
(Eudes-Deslongchamps, 1868)
Synonyms
  • Steneosaurus dubroviensis
  • Steneosaurus edwardsi Eudes-Deslongchamps, 1868
  • Steneosaurus hulkei Andrews, 1913
Skeleton at Peterborough Museum

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,[1] but was moved to its own genus in 2020. Steneosaurus durobrivensis and Steneosaurus hulkei are considered junior synonyms.[2]

In 2015, it was estimated at more than 7 m (23 ft) in length.[3] In 2016, this estimate was revised down to 6.6 m (22 ft), but even with such measurement, this animal remains to be the largest known Middle Jurassic crocodylomorph.[4]

  1. ^ Eudes-Deslongchamps E. 1867-1869. Notes Paléontologiques. Caen and Paris: 320-392.
  2. ^ Johnson, Michela M.; Young, Mark T.; Brusatte, Stephen L. (2020). "The phylogenetics of Teleosauroidea (Crocodylomorpha, Thalattosuchia) and implications for their ecology and evolution". PeerJ. 8: e9808. doi:10.7717/peerj.9808. PMC 7548081. PMID 33083104.
  3. ^ Michela M Johnson, Mark Thomas Young, Lorna Steel, Yves Lepage (July 2015). "Steneosaurus edwardsi (Thalattosuchia: Teleosauridae), the largest known crocodylomorph of the Middle Jurassic". Biological Journal of the Linnean Society. 115 (4): 911–918. doi:10.1111/bij.12525.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  4. ^ Young, MT; Rabi, M.; Bell, MA; Foffa, D.; Steel, L.; Sachs, S.; Peyer, K. (2016). "Big-headed marine crocodyliforms and why we must be cautious when using extant species as body length proxies for long-extinct relatives". Palaeontologia Electronica. 19 (3): 1–14. doi:10.26879/648.