Therochelonia

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

 
 
 
 
 
 
 
 
 
 

Therochelonia
Temporal range: Late Permian - Early Cretaceous
Life restoration of Cistecephalus Cistecephalus microrhinus
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Clade: Therapsida
Clade: †Dicynodontia
Clade: †Therochelonia
Seeley, 1894
Subgroups

See text.

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.


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