Eilenodontinae

Eilenodontinae; Temporal range:
	Skeleton of Priosphenodon avelasi
	Teeth and jaws of Eilenodon
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Order:	Rhynchocephalia
Suborder:	Sphenodontia
Subfamily:	†Eilenodontinae; Rasmussen and Callison 1981
Genera
	Eilenodon; Kaikaifilusaurus; Patagosphenos; Priosphenodon; Sphenotitan?; Toxolophosaurus;

Eilenodontinae are an extinct clade of reptiles belonging to Sphenodontia, related to the modern tuataras. They are either considered a subgroup of Opisthodontia,[1] or Sphenodontidae.[2] They had deep jaws with broad, closely packed teeth with thick enamel and noticeable wear facets. They were likely herbivorous, and probably chewed with a proal (forward stroke) movement, with food shredded between the edges of opposing wear facets. Members of the group are known from South America, North America and Europe.[3] Members of the group first appeared in the Late Triassic,[2] while the youngest members are known from the early Late Cretaceous of South America.[4]

References

Romo de Vivar, Paulo R.; Martinelli, Agustín G.; Schmaltz Hsiou, Annie; Soares, Marina Bento (2020-07-02). "A New Rhynchocephalian from the Late Triassic of Southern Brazil Enhances Eusphenodontian Diversity". Journal of Systematic Palaeontology. 18 (13): 1103–1126. doi:10.1080/14772019.2020.1732488. ISSN 1477-2019. S2CID 216226211.
Simões, Tiago R.; Kinney-Broderick, Grace; Pierce, Stephanie E. (2022-03-03). "An exceptionally preserved Sphenodon-like sphenodontian reveals deep time conservation of the tuatara skeleton and ontogeny". Communications Biology. 5 (1): 195. doi:10.1038/s42003-022-03144-y. ISSN 2399-3642. PMC 8894340. PMID 35241764.
Jones, Marc E. H.; Lucas, Peter W.; Tucker, Abigail S.; Watson, Amy P.; Sertich, Joseph J. W.; Foster, John R.; Williams, Ruth; Garbe, Ulf; Bevitt, Joseph J.; Salvemini, Floriana (June 2018). "Neutron scanning reveals unexpected complexity in the enamel thickness of an herbivorous Jurassic reptile". Journal of the Royal Society Interface. 15 (143): 20180039. doi:10.1098/rsif.2018.0039. ISSN 1742-5689. PMC 6030635. PMID 29899156.
Gentil, Adriel R.; Agnolin, Federico L.; Garcia Marsà, Jordi A.; Motta, Matias J.; Novas, Fernando E. (June 2019). "Bridging the gap: Sphenodont remains from the Turonian (Upper Cretaceous) of Patagonia. Palaeobiological inferences". Cretaceous Research. 98: 72–83. doi:10.1016/j.cretres.2019.01.016. S2CID 135429146.

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[1] Romo de Vivar, Paulo R.; Martinelli, Agustín G.; Schmaltz Hsiou, Annie; Soares, Marina Bento (2020-07-02). "A New Rhynchocephalian from the Late Triassic of Southern Brazil Enhances Eusphenodontian Diversity". Journal of Systematic Palaeontology. 18 (13): 1103–1126. doi:10.1080/14772019.2020.1732488. ISSN 1477-2019. S2CID 216226211.

[:0-2] Simões, Tiago R.; Kinney-Broderick, Grace; Pierce, Stephanie E. (2022-03-03). "An exceptionally preserved Sphenodon-like sphenodontian reveals deep time conservation of the tuatara skeleton and ontogeny". Communications Biology. 5 (1): 195. doi:10.1038/s42003-022-03144-y. ISSN 2399-3642. PMC 8894340. PMID 35241764.

[3] Jones, Marc E. H.; Lucas, Peter W.; Tucker, Abigail S.; Watson, Amy P.; Sertich, Joseph J. W.; Foster, John R.; Williams, Ruth; Garbe, Ulf; Bevitt, Joseph J.; Salvemini, Floriana (June 2018). "Neutron scanning reveals unexpected complexity in the enamel thickness of an herbivorous Jurassic reptile". Journal of the Royal Society Interface. 15 (143): 20180039. doi:10.1098/rsif.2018.0039. ISSN 1742-5689. PMC 6030635. PMID 29899156.

[4] Gentil, Adriel R.; Agnolin, Federico L.; Garcia Marsà, Jordi A.; Motta, Matias J.; Novas, Fernando E. (June 2019). "Bridging the gap: Sphenodont remains from the Turonian (Upper Cretaceous) of Patagonia. Palaeobiological inferences". Cretaceous Research. 98: 72–83. doi:10.1016/j.cretres.2019.01.016. S2CID 135429146.