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Cryptodontia is a group of dicynodont therapsids that includes the families Geikiidae, Oudenodontidae, and Rhachiocephalidae. It was first named in 1860 by English paleontologist Richard Owen. Owen intended Cryptodontia to be a family, and the name was later changed to "Cryptodontidae" to reflect this ranking. The name Cryptodontia was restored in 2009 when it was redefined as a larger clade containing several families of dicynodonts.[1]
Below is a cladogram from Kammerer et al. (2011) showing the phylogenetic placement of Cryptodontia:
Eodicynodon
Pylaecephalidae
Eumantellidae
Endothiodontidae
Emydopidae
Kingoriidae
Cistecephalidae
Myosauridae
Rhachiocephalidae
Oudenodontidae
Geikiidae
"Dicynodon"
Lystrosauridae
Shansiodontidae
Kannemeyeriidae
Stahleckeriidae
Dinodontosauridae
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