Teyumbaita

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title: "Teyumbaita" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["rhynchosauria", "late-triassic-reptiles-of-south-america", "triassic-brazil", "fossils-of-argentina", "fossils-of-brazil", "fossil-taxa-described-in-2010", "ischigualasto-formation", "tupi–guarani-languages", "prehistoric-reptile-genera", "triassic-argentina"] description: "Extinct genus of reptiles" topic_path: "linguistics" source: "https://en.wikipedia.org/wiki/Teyumbaita" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Extinct genus of reptiles ::

| fossil_range = | image = | image_caption = | taxon = Teyumbaita | authority = Montefeltro, Langer and Schultz, 2010 | subdivision_ranks = Species | subdivision = *†T. sulcognathus (Azevedo & Schultz, 1987) Montefeltro et al., 2010 | synonyms = *Scaphonyx sulcognathus Azevedo & Schultz, 1987 (type)

Teyumbaita is an extinct genus of hyperodapedontine rhynchosaur from the Upper Triassic of southern Brazil. Its fossils were recovered from the early Norian-age Caturrita Formation, one of several fossiliferous formations exposed at Paleorrota Geopark in the state of Rio Grande do Sul. Teyumbaita is likely the youngest valid genus of rhynchosaur, as other members of the group likely died out before the start of the Norian.

Fossils of Teyumbaita include two nearly complete skulls and a partial skull, all of which were discovered in the lower part of the Caturrita Formation. The fossils were first named as Scaphonyx sulcognathus, a species of Scaphonyx. The genus Scaphonyx is now considered to be a nomen dubium, so S. sulcognathus was reassigned to its own genus by Felipe Chinaglia Montefeltro, Max Cardoso Langer and Cesar Leandro Schultz in 2010. This new genus name, Teyumbaita, was constructed from "lizard (teyú) and parrot (mbaitá)" in the Brazilian aborigine Tupi-Guaraní language, and the combinatio nova is Teyumbaita sulcognathus. Fossil material of a second, yet-unnamed species, is known from the Hoyada del Cerro Las Lajas site of the Ischigualasto Formation in Argentina.

The teeth of T. sulcognathus have been found to contain flutes, a feature also known from Hyperodapedon fossils in both India and Brazil.

Phylogeny

Cladogram based on Montefeltro, Langer and Schultz (2010):

|label1=Rhynchosauria |1={{clade |1=Mesosuchus |2={{clade |1=Howesia |label2=Rhynchosauridae |2={{clade |1=Rhynchosaurus |2={{clade |1={{clade |1=Rhincossauro de Mariante |2=Stenaulorhynchus }} |2={{clade |1=Fodonyx |label2=Hyperodapedontinae |2={{clade |1=Isalorhynchus |2={{clade |1=Hyperodapedon |2=Teyumbaita }} }} }} }} }} }} }} }}

Material

Many specimens of T. sulcognathus have been found to date:

• UFRGS-PV-0232T (holotype) – partial skeleton with nearly complete skull
• UFRGS-PV-0298T – partial skeleton and nearly complete skull
• UFRGS-PV-0290T – partial skeleton and skull
• UFRGS-PV-0418T – partial right mandible
• UFRGS-PV-0420T – partial right dentary and postcrania
• UFRGS-PV-0445T – partial maxilla
• MCP-683 – partial left dentary

References

References

1. Felipe Chinaglia Montefeltro. (2010). "Cranial anatomy of a new genus of hyperodapedontine rhynchosaur (Diapsida, Archosauromorpha) from the Upper Triassic of southern Brazil". Earth and Environmental Science Transactions of the Royal Society of Edinburgh.
2. (2020). "The Late Triassic Ischigualasto Formation at Cerro Las Lajas (La Rioja, Argentina): fossil tetrapods, high-resolution chronostratigraphy, and faunal correlations". Scientific Reports.
3. (2 January 2023). "Assessing the diversity of hidden dental morphology in Hyperodapedontinae rhynchosaurs (Archosauromorpha, Rhynchosauria)". [[Historical Biology]].

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