Isotemnidae

Isotemnidae; Temporal range: Late Paleocene-Middle Miocene; (Itaboraian-Laventan); ~59.0–11.8 Ma PreꞒ Ꞓ O S D C P T J K Pg N
	Thomashuxleya
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Infraclass:	Placentalia
Order:	†Notoungulata
Suborder:	†Toxodontia
Family:	†Isotemnidae; Ameghino 1897
Genera
	†Anisotemnus; †Coelostylodon; †Distylophorus; †Hedralophus; †Isotemnus; †Itaboraitemnus; †Lophocoelus; †Maizotemnus; †Pampatemnus; †Periphragnis; †Pleurocoelodon; †Pleurostylodon; †Rhyphodon; †Thomashuxleya;

Isotemnidae is a paraphyletic extinct family of notoungulate mammals known from the Early Eocene (Itaboraian) to Middle Miocene (Honda Group, Laventan) of South America.^[3]

References

↑ Castro, L. O. R.; Bergqvist, L. P.; García-López, D. A. (2025). "First record of Toxodontia for the Itaboraí Basin (Paleogene, Rio de Janeiro, Brazil) and comments on the evolution of basal toxodonts (Pan-Perissodactyla, Mammalia)". Journal of Mammalian Evolution. 32 (3) 34. doi:10.1007/s10914-025-09770-7.
↑ Fernández, M.; Zimicz, A. N.; Troyelli, A.; Chornogubsky, L.; Bond, M.; Arnal, M.; Fernicola, J. C. (2025). "Maizotemnus archaeios gen. nov. sp. nov. the oldest Toxodontia (Mammalia, Panperissodactyla, Notoungulata) and the first South American mammal from the Paleocene–Eocene Thermal Maximum (Maíz Gordo formation, Salta Province, Argentina)". Historical Biology. 38 (3): 786–814. doi:10.1080/08912963.2025.2531581.
↑ 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