Trigonostylops

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title: "Trigonostylops" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["astrapotheria", "paleocene-mammals", "paleocene-mammals-of-south-america", "eocene-mammals-of-south-america", "tinguirirican", "divisaderan", "mustersan", "casamayoran", "riochican", "itaboraian", "paleogene-argentina", "paleogene-peru", "fossils-of-argentina", "fossils-of-peru", "eocene-mammals-of-antarctica", "fossils-of-antarctica", "fossil-taxa-described-in-1897", "taxa-named-by-florentino-ameghino", "prehistoric-placental-genera", "golfo-san-jorge-basin", "sarmiento-formation"] description: "Genus of mammals (fossil)" topic_path: "geography/argentina" source: "https://en.wikipedia.org/wiki/Trigonostylops" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Genus of mammals (fossil) ::

| image = Trigonostylops skull.jpg | image_caption = Skull restoration of Trigonostylops | fossil_range = Late Paleocene-Late Eocene (Riochican-Tinguirirican) ~ | taxon = Trigonostylops | authority = Ameghino 1897 | type_species = Trigonostylops wortmani | type_species_authority = Ameghino 1897 | subdivision_ranks = Species | subdivision =

• T. gegenbauri Roth 1899
• T. wortmani Ameghino 1897

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.

Description

::figure[src="https://upload.wikimedia.org/wikipedia/commons/f/f4/Trigonostylops_reconstruction.jpg" caption="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.

Phylogeny

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

|1=Eoastrapostylops |2={{clade |1=Trigonostylops |2={{clade |1=Tetragonostylops |2={{clade |1=Albertogaudrya |2={{clade |1=Scaglia |2={{clade |1=Astraponotus |2={{clade |1=Maddenia |2={{clade |1=Comahuetherium |2={{clade |1=Parastrapotherium |2={{clade |label1=Astrapotheriinae |1={{clade |1=Astrapotherium |2=Astrapothericulus }} |label2=Uruguaytheriinae |2={{clade |1=Uruguaytherium |2={{clade |1={{clade |1=Hilarcotherium |2=Xenastrapotherium }} |2=Granastrapotherium }} }} }} }} }} }} }} }} }} }} }} }}

Distribution

| relief = 1 | width = 270 | caption = Locations of Trigonostylops fossils [[File:Gold pog.svg|10px]] Pozo Formation [[File:Orange pog.svg|10px]] Sarmiento Formation [[File:Brown pog.svg|10px]] Las Flores Formation Not show: La Meseta Formation in Seymour Island, Antarctica | places = | lat_deg = -7.3 | lon_deg = -74.9 | mark = Gold pog.svg | marksize = 12 | lat_deg = -46.7 | lon_deg = -67.1 | mark = Orange pog.svg | marksize = 12 | lat_deg = -45.6 | lon_deg = -69.1 | mark = Brown pog.svg | marksize = 12 Fossils of Trigonostylops have been found in:

;Paleocene

• Las Flores Formation, Argentina

;Eocene

• La Meseta Formation, Antarctica
• Casamayor, Divisadero Largo, Koluel Kaike and Sarmiento Formations, Argentina
• Pozo Formation, Peru

References

Bibliography

References

1. (1999). "The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals". Marshall Editions.
2. Vallejo Pareja et al., 2015
3. [https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=43458 ''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

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