Extinct genus of dicynodonts
Lanthanostegus is an extinct genus of non-mammalian synapsids from the Capitanian "Tapinocephalus" Assemblage Zone, Koonap Formation (Beaufort Group) of South Africa. The type and the only species is "Lanthanostegus mohoii".
Taxonomic history.
The animal was named as "Lanthanocephalus mohoii" by Modesto "et al." in 2002 but was recombined as "Lanthanostegus mohoii" in 2003, as the genus "Lanthanocephalus" was preoccupied by a coral. 
Phylogeny.
The topology follows Duhamel et al. (2024).
References.
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