201.3}}| image = Henodus chelyops 2 (cut out)-2.jpg| image_caption = Skeleton of the placodontian placodontiform Henodus chelyops| taxon = Placodontiformes| authority = Neenan et al., 2013| subdivision_ranks = Subgroups| subdivision = {{extinct}}Palatodonta{{extinct}}Atopodentatus?JOURNAL, 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, 10.7554/eLife.83163, 37551884, 10499374, free, {{extinct}}Placodontia}}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.JOURNAL, Neenan, J. M., Klein, N., Scheyer, T. M., European origin of placodont marine reptiles and the evolution of crushing dentition in Placodontia, 10.1038/ncomms2633, Nature Communications, 4, 1621, 2013, 23535642, 2013NatCo...4.1621N, free,

Phylogeny

Below is a cladogram from Neenan et al. (2013) showing the position of Placodontiformes within Sauropterygia:{{clade| style=font-size:100%;line-height:85%|label1=Sauropterygia|1={{clade

|label1=Placodontiformes
|1={{clade
|1=Palatodonta
|label2=Placodontia
|2={{clade
|1=Paraplacodus (File:Paraplacodus BW.jpg|75px)
|2={{clade
|1=Placodus (File:Placodus BW.jpg|75px)
|label2=Cyamodontoidea
|2={{clade
|1=Cyamodus (File:Cyamodus BW.jpg|75px)
|2=Psephoderma (File:Psephoderma BW.jpg|75px)}} }} }} }}
|label2=Eosauropterygia
|2={{clade
|1={{clade
|label1=Pistosauroidea
|1={{clade
|1=Yunguisaurus
|2={{clade
|1=Plesiosauria (File:Macroplata BW.jpg|75px)
|2={{clade
|1=Pistosaurus (File:Pistosaurus BW.jpg|75px)
|2=Augustasaurus}} }} }} }}
|2={{clade
|1={{clade
|1=Corosaurus
|2=Cymatosaurus}}
|2={{clade
|1=Nothosauroidea (File:Nothosaurus BW.jpg|75px)
|2={{clade
|1=Diandongosaurus
|2=Pachypleurosauria (File:Keichousaurus BW.jpg|75px)

}} }} }} }} }} }}

References

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