Placodontiformes

Placodontiforms; Temporal range: Middle - Late Triassic, ; 246–201.3 Ma PreꞒ Ꞓ O S D C P T J K Pg N
	Skeleton of the placodontian placodontiform Henodus chelyops
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Superorder:	† Sauropterygia
Clade:	† Placodontiformes ; Neenan et al., 2013
Subgroups
	† Atopodentatus ?; † Palatodonta ; † Placodontia ;

Last updated May 27, 2025

Placodontiformes is an extinct clade of sauropterygian marine reptiles that includes placodonts and the non-placodont Palatodonta . It was erected in 2013 with the description of Palatodonta. Placodontiformes is the most basal clade of Sauropterygia and the sister group of Eosauropterygia, which includes all other sauropterygians.^[2]

Phylogeny

Below is a cladogram from Neenan et al. (2013) showing the position of Placodontiformes within Sauropterygia:^[2]

Placodontiformes

	Cyamodus

	Psephoderma

	Pistosaurus

	Augustasaurus

	Corosaurus

	Cymatosaurus

Nothosauroidea

	Diandongosaurus

	Pachypleurosauria

References

↑ Wolniewicz, A. S.; Shen, Y.; Li, Q.; Sun, Y.; Qiao, Y.; Chen, Y.; Hu, Y.-W.; Liu, J. (2023). "An armoured marine reptile from the Early Triassic of South China and its phylogenetic and evolutionary implications". eLife. 12. doi: 10.7554/eLife.83163 . PMC 10499374 . PMID 37551884.
1 2 Neenan, J. M.; Klein, N.; Scheyer, T. M. (2013). "European origin of placodont marine reptiles and the evolution of crushing dentition in Placodontia". Nature Communications. 4: 1621. Bibcode:2013NatCo...4.1621N. doi: 10.1038/ncomms2633 . PMID 23535642.

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[Prosaurosphargis-1] Wolniewicz, A. S.; Shen, Y.; Li, Q.; Sun, Y.; Qiao, Y.; Chen, Y.; Hu, Y.-W.; Liu, J. (2023). "An armoured marine reptile from the Early Triassic of South China and its phylogenetic and evolutionary implications". eLife. 12. doi: 10.7554/eLife.83163 . PMC 10499374 . PMID 37551884.

[Palatodonta-2] 1 2 Neenan, J. M.; Klein, N.; Scheyer, T. M. (2013). "European origin of placodont marine reptiles and the evolution of crushing dentition in Placodontia". Nature Communications. 4: 1621. Bibcode:2013NatCo...4.1621N. doi: 10.1038/ncomms2633 . PMID 23535642.

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