Trigonostylops

Trigonostylops
Temporal range: Late Paleocene-Late Eocene (Itaboraian-Tinguirirican)
~58.7–33.9 Ma
Trigonostylops skull.
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Superorder: †Meridiungulata
Order: †Astrapotheria
Family: †Trigonostylopidae
Genus: †Trigonostylops
Type species
Trigonostylops wortmani
Ameghino, 1897

Trigonostylops is an extinct genus of South American meridiungulatan ungulate, from the Late Paleocene to Late Eocene of Argentina and Peru.

Description

Life restoration 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 tusks. In comparison with the later Astrapotherium magnum, it is estimated to have been around 1.50 m (5 ft) long.[1] Teeth, primarily molars, have been found and assigned to other species.

Phylogeny

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

 

Eoastrapostylops

 
 

 

Trigonostylops

 
 

 

Tetragonostylops

 
 

 

Albertogaudrya

 
 

 

Scaglia

 
 

 

Astraponotus

 
 

 

Maddenia

 
 

 

Comahuetherium

 
 

 

Parastrapotherium

 
 

Astrapotheriinae

 

Astrapotherium

 
 

Astrapothericulus

 
 
Uruguaytheriinae

 

Uruguaytherium

 
 

 

 

Hilarcotherium

 
 

Xenastrapotherium

 
 
 

Granastrapotherium

 
 
 
 
 
 
 
 
 
 
 
 

Distribution

Fossils of Trigonostylops have been found in:[3]

Paleocene
Eocene
  • Casamayor, Divisadero Largo, Koluel Kaike and Sarmiento Formations, Argentina
  • Pozo Formation, Peru

References

  1. ↑ Palmer, D., ed. (1999). The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals. London: Marshall Editions. p. 249. ISBN 1-84028-152-9.
  2. ↑ Vallejo-Pareja, M. C.; Carrillo, J. D.; Moreno-Bernal, J. W.; Pardo-Jaramillo, M.; Rodriguez-Gonzalez, D. F.; Muñoz-Duran, J. (2015). "Hilarcotherium castanedaii, gen. et sp. nov., a new Miocene astrapothere (Mammalia, Astrapotheriidae) from the Upper Magdalena Valley, Colombia" (PDF). Journal of Vertebrate Paleontology. 35 (2): e903960. doi:10.1080/02724634.2014.903960. (Subscription required (help)).
  3. ↑ Trigonostylops at Fossilworks.org


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