Trigonostylops is an extinct genus of South American meridiungulatan ungulate, from the Late Paleocene to Late Eocene (Itaboraian to Tinguirirican in the SALMA classification) of South America (Argentina and Peru) and Antarctica (Seymour Island). It is the only member of the family Trigonostylopidae.

Trigonostylops
Temporal range: Late Paleocene-Late Eocene
(Riochican-Tinguirirican)
~58.7–33.9 Ma
Skull restoration of Trigonostylops
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Astrapotheria
Family: Trigonostylopidae
Genus: Trigonostylops
Ameghino 1897
Type species
Trigonostylops wortmani
Ameghino 1897
Species
  • T. gegenbauri Roth 1899
  • T. wortmani Ameghino 1897

Description

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Interpretation of T. wortmani

A complete skull of the type species, T. wortmani, has been found, and it has been classified as an astrapothere based on its large lower incisors.[1]

Phylogeny

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Cladogram based in the phylogenetic analysis published by Vallejo Pareja et al., 2015, showing the position of Trigonostylops:[2]

Eoastrapostylops

Distribution

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Fossils of Trigonostylops have been found in:[3]

Paleocene
Eocene

References

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  1. ^ Palmer, D., ed. (1999). The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals. London: Marshall Editions. p. 249. ISBN 978-1-84028-152-1.
  2. ^ Vallejo Pareja et al., 2015
  3. ^ Trigonostylops at Fossilworks.org
  4. ^ Goin et al., 2009
  5. ^ Dzik & Gaździcki, 2001
  6. ^ Vera, 2012
  7. ^ Cifelli, 29185, p.5
  8. ^ Antoine et al., 2011

Bibliography

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