Hegetotheriidae

Hegetotheriidae; Temporal range: Late Oligocene–Early Pleistocene PreꞒ Ꞓ O S D C P T J K Pg N
	Prosotherium garzoni (=Propachyrucos ameghinorum).
	Life restoration of Hegetotherium
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Infraclass:	Placentalia
Order:	†Notoungulata
Suborder:	†Typotheria
Family:	†Hegetotheriidae; Ameghino, 1894
Subfamilies and genera
	†Hegetotheriinae †Ethegotherium; †Hegetotherium; †Hemihegetotherium; †Prohegetotherium; †Pseudohegetotherium; †Pachyrukhinae †Medistylus; †Propachyrucos; †Prosotherium Pachyrukhini †Pachyrukhos; †Paedotherium; †Tremacyllus; ; ;

Hegetotheriidae is an extinct family of notoungulate mammals known from the Oligocene through the Pliocene of South America.^[1]^[2] The family underwent many sequential radiation events throughout the Cenozoic, which led to Hegetotheriids being among the most diverse of the Typotheria.^[3]

Description

Hegetotheriids are anatomically convergent with caviomorph rodents, possessing hypertrophied (enlarged) incisors. The incisors of Hegetotheriids are also hypsodont, scalpriform and procumbent, indicating a diet of abrasive plants. This is due to the fact that Hegetotheriids, living in the southernmost portions of South America, had a diet consisting of both Neotropical and Andean flora.^[3]

Classification

Hegetotheriidae is placed in Typotheria, a clade of rodent-like notoungulates. Historically, there has been debate as to whether Hegetotheriidae should be split from the other Typotheres,^[4] though this view is not upheld.^[3]

References

↑ McKenna, Malcolm C., and Bell, Susan K. 1997. Classification of Mammals Above the Species Level. Columbia University Press, New York, 631 pp. ISBN 0-231-11013-8
↑ "Fossilworks: Hegetotheriidae". fossilworks.org. Archived from the original on 13 December 2021. Retrieved 17 December 2021.
1 2 3 Phylogeny and paleobiogeography of Hegetotheriidae (Mammalia, Notoungulata), Taylor & Francis, 2017-04-07, doi:10.6084/m9.figshare.4743550.v1, retrieved 2025-09-05
↑ Ameghino, Florentino (1889). Contribucion al conocimiento de los mamiferos fosiles de la República Argentina: Obra escrita bajo los auspicios de la Academia nacional de ciencias de la República Argentina para ser presentada á la Exposicion universal de Paris de 1889 (in Spanish). P. E. Coni é hijos.

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[1] McKenna, Malcolm C., and Bell, Susan K. 1997. Classification of Mammals Above the Species Level. Columbia University Press, New York, 631 pp. ISBN 0-231-11013-8

[2] "Fossilworks: Hegetotheriidae". fossilworks.org. Archived from the original on 13 December 2021. Retrieved 17 December 2021.

[:0-3] 1 2 3 Phylogeny and paleobiogeography of Hegetotheriidae (Mammalia, Notoungulata), Taylor & Francis, 2017-04-07, doi:10.6084/m9.figshare.4743550.v1, retrieved 2025-09-05

[4] Ameghino, Florentino (1889). Contribucion al conocimiento de los mamiferos fosiles de la República Argentina: Obra escrita bajo los auspicios de la Academia nacional de ciencias de la República Argentina para ser presentada á la Exposicion universal de Paris de 1889 (in Spanish). P. E. Coni é hijos.

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Hegetotheriidae Temporal range: Late Oligocene–Early Pleistocene PreꞒ Ꞓ O S D C P T J K Pg N

Prosotherium garzoni (=Propachyrucos ameghinorum).

Life restoration of Hegetotherium
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Infraclass:	Placentalia
Order:	†Notoungulata
Suborder:	†Typotheria
Family:	†Hegetotheriidae Ameghino, 1894
Subfamilies and genera
†Hegetotheriinae †Ethegotherium †Hegetotherium †Hemihegetotherium †Prohegetotherium †Pseudohegetotherium †Pachyrukhinae †Medistylus †Propachyrucos †Prosotherium Pachyrukhini †Pachyrukhos †Paedotherium †Tremacyllus