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Seldsienean; Temporal range: Middle Jurassic, Bathonian PreꞒ Ꞓ O S D C P T J K Pg N ↓
	Holotype skull
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Clade:	Archosauria
Clade:	Pseudosuchia
Clade:	Crocodylomorpha
Clade:	Crocodyliformes
Suborder:	†Thalattosuchia
Family:	†Machimosauridae
Genus:	†Seldsienean; Johnson et al., 2020
Species:	†S. megistorhynchus
Binomial name
	†Seldsienean megistorhynchus; (Eudes-Deslongchamps, 1866)
Synonyms
	Steneosaurus megistorhynchus Eudes-Deslongchamps, 1866;

Seldsienean (Old English for "seldom seen one") in an extinct genus of machimosaurid thalattosuchian from the Middle Jurassic of England and France.^[1] It is known from the Calcaire de Caen and the Cornbrash Formation.^[1]

Its type species, S. megistorhynchus, was originally described as a species of Steneosaurus in 1866,^[2] but was given its own genus in 2020.^[1]

References

^ ^a ^b ^c 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. ISSN 2167-8359. PMC 7548081. PMID 33083104.
^ Eudes-Deslongchamps, J. A. "Sur la découverte d’une mâchoire inférieure entière de Steneosaurus megistorhynchus (GEOFF.) trouvée à Allemagne et comparaison de cette espèce avec le Teleosaurus larteti (DESL.)." Bulletin de la Société linnéenne de Normandie 10 (1866): 80-85.