Cadurcodon ardynensis was an odd-toed ungulate that lived in what is now Mongolia during the late Eocene, about 37-34 million years ago.
It was around 2m long (6'6") and, despite its very tapir-like appearance and lack of horns, it was actually closer related to modern rhinoceroses – it was part of a group of early rhino-cousins known as amynodontids, which convergently evolved both hippo-like and tapir-like lifestyles.
Cadurcodon was the most tapir-like of the tapir-like amynodontids, with a short deep skull and retracted nasal bones that indicate it had a well-developed prehensile trunk. Males also had large tusks formed from their upper and lower canine teeth, which may have been used for fighting each other.
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References:
Averianov, Alexander, et al. "A new amynodontid from the Eocene of South China and phylogeny of Amynodontidae (Perissodactyla: Rhinocerotoidea)." Journal of Systematic Palaeontology 15.11 (2017): 927-945. https://doi.org/10.1080/14772019.2016.1256914
Громова, В. [Gromova, V.] Болотные носороги (Amydontidae) Монголии. [Swamp rhinoceroses (Amynodontidae) of Mongolia.] Trudi Paleontol. Inst., Akad. Nauk SSSR 55:85-189 (1954) https://www.geokniga.org/books/13983
Prothero, Donald R., and Robert M. Schoch. Horns, tusks, and flippers: the evolution of hoofed mammals. JHU Press, 2002. http://www.rhinoresourcecenter.com/pdf_files/141/1415340780.pdf
Wall, William P. "Cranial evidence for a proboscis in Cadurcodon and a review of snout structure in the family Amynodontidae (Perissodactyla, Rhinocerotoidea)." Journal of Paleontology (1980): 968-977. https://www.jstor.org/stable/1304363
Wikipedia contributors. “Amynodontidae.” Wikipedia, 17 Dec. 2023, https://en.wikipedia.org/wiki/Amynodontidae
Wikipedia contributors. “Ergilin Dzo Formation.” Wikipedia, 12 Feb. 2024, https://en.wikipedia.org/wiki/Ergilin_Dzo_Formation
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