Rastodon Temporal range: Mid-Late Permian ~268–259 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Synapsida
Clade:	Therapsida
Suborder:	†Anomodontia
Clade:	†Dicynodontia
Clade:	†Bidentalia
Genus:	†Rastodon Boos et al. 2016
Species
R. procurvidens Boos et al. 2016 (type)

Rastodon is an extinct genus of dicynodont. Uniquely among dicynodonts, its tusks curve forward. The type and only species is R. procurvidens.^[1]

Rastodon is derived from the Rio do Rasto Formation, where its remains were found, and the Greek word for "tooth". The species name, R. procurvidens, means "curved forward tooth" and describes its uniquely shaped teeth.^[1]

Only a single specimen of Rastodon has been discovered so far. It comes from Guadalupian deposits found at an outcrop of the Rio do Rasto Formation at the Boqueirão Farm, in the municipality of São Gabriel, Rio Grande do Sul, Brazil. .

Rastodon is a fairly typical dicynodont. It bore a beaked head with a single pair of tusks and a keratin-covered nasal boss. However, it does possess several distinctive traits, of which its anteriorly-curved tusks are the most distinctive. Furthermore, its skull is relatively long and shallow compared to its close relatives. Its tusks contacted the lower jaw during propalinal mastication.

Rastodon has been recovered as the basalmost bidentalian dicynodont.^[1] However, the phylogenetic position of Rastodon is contentious,^[2] for it has also been recovered as the basalmost emydopoid dicynodont.^[3]

• List of synapsids

v t e Anomodontia
Kingdom: Animalia Phylum: Chordata Clade: Synapsida Clade: Therapsida Synapsida see Synapsida Anomodontia see below↓
Anomodontia Anomodontia Biseridens Novocynodon? Anomocephaloidea Anomocephalus Tiarajudens Venyukovioidea Otsheria Parasuminia Suminia Ulemica Venyukovia Chainosauria Galechirus Galeops Galepus Patranomodon Anomocephaloidea? Dicynodontia see below↓
Dicynodontia Dicynodontia Brachyprosopus Colobodectes Eodicynodon Lanthanostegus Nyaphulia Pristerodon Pylaecephalidae Diictodon Eosimops Prosictodon Robertia Endothiodontia Abajudon Endothiodon Niassodon Therochelonia Emydopoidea Digalodon Emydorhinus? Palemydops? Emydopidae Compsodon Emydops Myosauridae Myosauroides Myosaurus Kingoriidae Dicynodontoides Kombuisia Thliptosaurus Cistecephalidae Cistecephaloides Cistecephalus Kawingasaurus Kembawacela Sauroscaptor Bidentalia see below↓
Bidentalia Bidentalia Daqingshanodon Idelesaurus Keyseria Odontocyclops Rastodon Syops Elphidae Elph Interpresosaurus Katumbia Geikiidae Aulacephalodon Bulbasaurus Geikia Pelanomodon Oudenodontidae Australobarbarus Oudenodon Tropidostoma Rhachiocephalidae Kitchinganomodon Rhachiocephalus Dicynodontoidea Counillonia Daptocephalus Delectosaurus Dicynodon Dinanomodon Gordonia Kunpania Peramodon Repelinosaurus Taoheodon Turfanodon Vivaxosaurus Lystrosauridae Basilodon? Euptychognathus? Jimusaria? Kwazulusaurus Lystrosaurus Sintocephalus? Kannemeyeriiformes see below↓
Kannemeyeriiformes Kannemeyeriiformes Angonisaurus Dinodontosaurus Elephantosaurus Woznikella Shansiodontidae Shansiodon Tetragonias Vinceria Rhinodicynodon Kannemeyeriidae Acratophorus Dolichuranus Kannemeyeria Parakannemeyeria Rabidosaurus Rechnisaurus Rhadiodromus Shaanbeikannemeyeria Sinokannemeyeria Uralokannemeyeria Wadiasaurus Xiyukannemeyeria Stahleckeriidae Sungeodon Placeriinae Argodicynodon Lisowicia Moghreberia Pentasaurus Placerias Zambiasaurus Stahleckeriinae Eubrachiosaurus Ischigualastia Jachaleria Sangusaurus Stahleckeria Ufudocyclops
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