Paratrigodon

Paratrigodon; Temporal range: Early Miocene-Late Miocene (Laventan-Chasicoan); ~
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	†Notoungulata
Family:	†Toxodontidae
Genus:	†Paratrigodon; Cabrera & Kraglievich, 1931
Species:	†P. euguii
Binomial name
	†Paratrigodon euguii; Cabrera & Kraglievich, 1931

Paratrigodon is a extinct genus notoungulate belonging to the subfamily Toxodontinae, containing one species, P. euguii.[1] Like its close relative Trigodon, it is known for the presence of a horn-like protuberance on its forehead. Fossils of Paratrigodon are known from the Arroyo Chasicó Formation dating from the Chasicoan period, and teeth from the Laventan-aged Quebrada Honda Fauna of Bolivia were also associated with the genus, although considered too different from the type species to be assigned to it.[1]

Description

Paratrigodon was originally described in 1931 from remains coming from the Arroyo Chasicó Formation of Argentina. The holotype, MLP 12-1664 preserved the basis and the rostral part of the crania of an adult specimen, including the zygomatic bone. The skull was larger than Trigodon, with an enlarged rostral part and broad incisors, similar to Toxodon, and a strong protuberance on its forehead. [2] It is different from most toxodonts by having upper molars with a single non-bifurcating enamel fold and a smooth distolingual sulcus. Its species name honors Bernardo Eugui, a member of the paleontogy department of the La Plata Museum, who recovered most of the material assigned to the holotype.[1]

References

Croft, D. A. (2007). "The Middle Miocene (Laventan) Quebrada Honda Fauna, Southern Bolivia and A Description of its Notoungulates". Palaeontology. 50 (1): 107–113. doi:10.1111/j.1475-4983.2006.00610.x. S2CID 140161482.
Cabrera, A.; Kraglievich, J. L. (1931). "Diagnosis previas de los ungulados fósiles del arroyo Chasicó". Journal of Mammalian Evolution. 1: 107–113.

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[:0-1] Croft, D. A. (2007). "The Middle Miocene (Laventan) Quebrada Honda Fauna, Southern Bolivia and A Description of its Notoungulates". Palaeontology. 50 (1): 107–113. doi:10.1111/j.1475-4983.2006.00610.x. S2CID 140161482.

[2] Cabrera, A.; Kraglievich, J. L. (1931). "Diagnosis previas de los ungulados fósiles del arroyo Chasicó". Journal of Mammalian Evolution. 1: 107–113.