It also has a sharply sloped snout, large eye sockets, and tusks that are positioned forward in the upper jaw.

S. gilli and S. woodwardi were later considered valid species of Dicynodon (although they are currently classified in the genera Dinanomodon and Basilodon), and S. jouberti has since been transferred to the genus Diictodon.

Because a genus is defined by its type species, the abandonment of S. alticeps implied that the name Sintocephalus was no longer valid.

[1] Following a phylogenetic analysis of dicynodonts by Christian F. Kammerer, Kenneth D. Angielczyk, and Jörg Fröbisch in 2011, Sintocephalus was reinstated as a valid genus including the species S. alticeps.

Below is a cladogram showing the phylogenetic placement of Sintocephalus in the analysis of Kammerer et al. (2011):[1] Interpresosaurus Elph Katumbia Gordonia traquairi Delectosaurus Vivaxosaurus trautscholdi Dicynodon lacerticeps Dicynodon huenei Daptocephalus leoniceps Dinanomodon gilli Peramodon amalitzkii Jimusaria sinkianensis Syops vanhoepeni Euptychognathus bathyrhynchus