# Bothriogenys

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***Bothriogenys*** is a [genus](/source/Genus) of [anthracotheres](/source/Anthracothere) that lived in [Eastern Africa](/source/Eastern_Africa) during the [Late Eocene](/source/Priabonian) to [Early Oligocene](/source/Rupelian).[1]

## Distribution

Most fossils have been found in [Fayum](/source/Fayum), [Egypt](/source/Egypt), but one [species](/source/Species), *B. orientalis*, is known from Late Eocene deposits in [Thailand](/source/Thailand). It is believed to have originated from the Asian genus *[Anthracokeryx](/source/Anthracokeryx)*.[2] *Bothriogenys* is believed to be one of the first anthracotheriids to have entered [Africa](/source/Africa).[3]

## Description

In life, they would have resembled [hippopotamuses](/source/Hippopotamus) with small, elongated heads.

## Palaeobiology

### Growth and development

The deciduous [premolars](/source/Premolar) in the [mandible](/source/Mandible) of *B. fraasi* were retained all the way until the third mandibular [molar](/source/Molar_(tooth)) began developing in the [crypt](/source/Tooth_eruption), in contrast to the modern hippopotamus that sheds all deciduous premolars by the time its M3 develops in the crypt.[4]

## References

1. Werdelin, Lars & Sanders, William Joseph (2010-07-20). [*Cenozoic Mammals of Africa*](https://books.google.com/books?id=6c8lDQAAQBAJ). Univ of California Press. pp. 843–846. ISBN 978-0-520-25721-4.

1. Fleagle, John G. & Kay, Richard F. (2013-11-11). [*Anthropoid Origins*](https://books.google.com/books?id=eW3lBwAAQBAJ). Springer Science & Business Media. p. 307. ISBN 978-1-4757-9197-6.

1. Sileem, Afifi H. & Abu El‐Kheir, Gebely A. (11 September 2022). ["Complete skull of Bothriogenys fraasi (Mammalia, Artiodactyla, Anthracotheriidae) from the Early Oligocene, Fayum, Egypt"](https://onlinelibrary.wiley.com/doi/abs/10.1002/gj.4574). *[Geological Journal](/source/Geological_Journal)*. **57** (11): 4833–4841. [doi:10.1002/gj.4574](https://doi.org/10.1002/gj.4574). [ISSN 0072-1050](https://www.worldcat.org/issn/0072-1050). Retrieved 21 February 2025. – via Wiley Online Library.

1. Sallam, Hesham; Sileem, Afifi H.; Miller, Ellen R.; Gunnell, Gregg F. (16 August 2016). ["Deciduous dentition and dental eruption sequence of Bothriogenys fraasi (Anthracotheriidae, Artiodactyla) from the Fayum Depression, Egypt"](https://palaeo-electronica.org/content/in-press/1595-anthracotheriidae-from-egypt). *[Palaeontologia Electronica](/source/Palaeontologia_Electronica)*. [doi:10.26879/646](https://doi.org/10.26879/646). [ISSN 1094-8074](https://www.worldcat.org/issn/1094-8074). Retrieved 14 February 2026. – via Palaeontologia Electronica.

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