Therochelonia

Therochelonia Temporal range: Late Permian - Early Cretaceous
Life restoration of Cistecephalus Cistecephalus microrhinus
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Synapsida
Order:	Therapsida
Clade:	†Chainosauria
Infraorder:	†Dicynodontia
Parvorder:	†Therochelonia Seeley, 1894
Subgroups
See text.

Therochelonia is a group of dicynodont therapsids. The group was named by British paleontologist Harry Seeley in 1894 and fell into disuse in the following century. Therochelonia was redefined as a node-based clade in 2009. It is defined as the last common ancestor of Cistecephalus microrhinus and Dicynodon lacerticeps, and all of its descendants.^[1] Below is a simplified cladogram from Kammerer et al. (2011) showing the phylogenetic placement of Therochelonia:^[2]

Dicynodontia	Eodicynodon Pylaecephalidae Eumantellidae Endothiodontidae  Therochelonia   Emydopoidea  Emydopidae Kingoriidae Cistecephalidae Myosauridae  Bidentalia   Cryptodontia  Rhachiocephalidae Oudenodontidae Geikiidae  Dicynodontoidea  "Dicynodon" Lystrosauridae  Kannemeyeriiformes  Shansiodontidae Kannemeyeriidae Stahleckeriidae Dinodontosauridae

References

1. Kammerer, C.F.; Angielczyk, K.D. (2009). "A proposed higher taxonomy of anomodont therapsids" (PDF). Zootaxa 2018: 1–24.
2. Kammerer, C.F.; Angielczyk, K.D.; Fröbisch, J. (2011). "A comprehensive taxonomic revision of Dicynodon (Therapsida, Anomodontia) and its implications for dicynodont phylogeny, biogeography, and biostratigraphy". Journal of Vertebrate Paleontology 31 (Suppl. 1): 1–158. doi:10.1080/02724634.2011.627074.