R. broomianus and R. beaufortensis have been synonymized with R. whaitsi, while R. capensis has been moved out of the genus into Rhinesuchoides. Muchocephalus has also been synonymized with R. whaitsi.
The taxonomic classification of these species has changed.  R. broomianus and R. beaufortensis are now considered to be one species, R. whaitsi.  R. capensis has been moved from the genus to a new genus called Rhinesuchoides. Muchocephalus is also now part of the same species as R. whaitsi.