Extinct family of dicynodonts
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; although "Pylaecephalus" itself is considered a junior synonym of "Diictodon", the name Pylaecephalidae predates these names and therefore takes priority.
Phylogeny.
Below is a cladogram modified from Angielczyk et al. (2021):
References.
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