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Temporal range: Permian
Fossil of Diictodon
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Synapsida
Order: Therapsida
Clade: Chainosauria
Infraorder: Dicynodontia
Family: Pylaecephalidae
van Hoepen, 1934
  • Diictodontidae Cluver and King, 1983
  • Robertiidae Cluver et King, 1983

Pylaecephalidae is a family of dicynodont therapsids that includes Diictodon, Robertia, and Prosictodon from the Permian of South Africa. Pylaecephalids were small burrowing dicynodonts with long tusks. The family was first named in 1934 and was redefined in 2009. Diictodontidae and Robertiidae are considered junior synonyms of Pylaecephalidae.


  1. Kammerer, C.F.; and Angielczyk, K.D. (2009). "A proposed higher taxonomy of anomodont therapsids". Zootaxa 2018: 1–24.  Cite uses deprecated parameters (help)
  2. Kenneth D. Angielczyk; Bruce S. Rubidge (2010). "A new pylaecephalid dicynodont (Therapsida, Anomodontia) from the Tapinocephalus Assemblage Zone, Karoo Basin, Middle Permian of South Africa". Journal of Vertebrate Paleontology 30 (5): 1396–1409. doi:10.1080/02724634.2010.501447. 

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