Dodatak:Abecedni popis synapsida: R
Ra
uredi†Rabidosaurus Kalandadze 1970
uredi- †Rabidosaurus cristatus Kalandadze 1970
Animalia → Chordata → Synapsida → Therapsida → Dicynodontidae
Ro
uredi†Robertiidae Cluver and King 1983
urediAnimalia → Chordata → Synapsida → Therapsida
Ru
uredi- Rubidgea †
- Rubidgeidae †
- Rubidgeinae †
- Ruthiromia,