Lanthanostegus

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).