Extinct clade of reptiles
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.
Phylogeny.
Below is a cladogram from Neenan "et al." (2013) showing the position of Placodontiformes within Sauropterygia:
References.
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