| 词条 | Rastodon |
| 释义 |
| name = Rastodon | taxon = Rastodon | fossil_range = Mid-Late Permian ~{{fossil range|268|259}} | authority = Boos et al. 2016 | subdivision_ranks = Species | subdivision=
}} Rastodon is an extinct genus of anomodonts. It is the oldest and most basal known genus of bidentalian dicynodonts. Uniquely among dicynodonts, its tusks curve forward. The type and only species is R. procurvidens. EtymologyRastodon 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. ProvenanceOnly a single specimen of Rastodon has been discovered so far. It comes from the Rio do Rasto Formation, of the Guadalupian of Brazil. DescriptionRastodon 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. ClassificationRastodon is most parsimoniously placed as the basalmost bidental dicynodont, although it may be slightly more derived within Bidentalia. See also{{portal|Paleontology|Permian|Prehistory of South America}}
References}} 8 : Anomodont genera|Dicynodonts|Prehistoric synapsids of South America|Permian animals of South America|Permian Brazil|Fossils of Brazil|Paraná Basin|Fossil taxa described in 2016 |
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