Notoungulata

Restoration of Thomashuxleya, an early Notoungulate (Isotemnidae) from the Eocene (Lutetian) of Argentina

Notoungulata is divided into two major suborders, Typotheria and Toxodontia, alongside some basal groups (Notostylopidae and Henricosborniidae) which are potentially paraphyletic.[3] Due to the isolated nature of South America, many notoungulates evolved along convergent lines into forms that resembled mammals on other continents. Examples of this are Pachyrukhos, a notoungulate that filled an ecological niche similar to those of rabbits and hares, and Homalodotherium, which resembled chalicotheres. The families Interatheriidae, Hegetotheriidae, Mesotheriidae and Toxodontidae separately evolved high crowned (hypsodont) ever-growing teeth.[4] During the Pleistocene, Toxodon was the largest common notoungulate. Most of the group (Mixotoxodon, Piauhytherium and Toxodon being exceptions) became extinct after the landbridge between North and South America formed and allowed North American ungulates to enter South America in the Great American Interchange, and then to out-compete the native fauna.[5][6][7] Mixotoxodon was the only member of the group to be successful in invading Central America and southern North America, reaching as far north as Texas.[8]

Skull of Hegetotherium

Skull of Mesotherium (Mesotheriidae)

This order is united with other South American ungulates in the super-order Meridiungulata. The notoungulate and litoptern native ungulates of South America have been shown by studies of collagen and mitochondrial DNA sequences to be a sister group to the perissodactyls, making them true ungulates.[9][10][11] The estimated divergence date is 66 million years ago.[11] This conflicts with the results of some morphological analyses which favoured them as afrotherians. It is in line with some more recent morphological analyses which suggested they were basal euungulates. Panperissodactyla has been proposed as the name of an unranked clade to include perissodactyls and their extinct South American ungulate relatives.[9]

Cifelli has argued that Notioprogonia is paraphyletic, as it would include the ancestors of the remaining suborders. Similarly, Cifelli indicated that Typotheria would be paraphyletic if it excluded Hegetotheria and he advocated inclusion of Archaeohyracidae and Hegetotheriidae in Typotheria.[12]

Notoungulata were for many years taken to include the order Arctostylopida, whose fossils are found mainly in China. Recent studies, however, have concluded that Arctostylopida are more properly classified as gliriforms, and that the notoungulates were therefore never found outside South and Central America.[13]

Based on an analysis of 133 morphological characters in 50 notoungulate genera, Billet in 2011 concluded that Homalodotheriidae, Leontiniidae, Toxodontidae, Interatheriidae, Mesotheriidae, and Hegetotheriidae are the only monophyletic families of notoungulates.[14]

• Order Notoungulata - notoungulates
  • Suborder Notioprogonia
    • Family Henricosborniidae
    • Family Notostylopidae
  • Suborder Toxodonta
    • Family Isotemnidae
    • Family Leontiniidae
    • Family Notohippidae
    • Family Toxodontidae
    • Family Homalodotheriidae
  • Suborder Typotheria
    • Family Archaeopithecidae
    • Family Oldfieldthomasiidae
    • Family Interatheriidae
    • Family Campanorcidae
    • Family Mesotheriidae
  • Suborder Hegetotheria
    • Family Archaeohyracidae
    • Family Hegetotheriidae

• Carroll, Robert Lynn (1988). Vertebrate Paleontology and Evolution. New York: W.H. Freeman and Company. ISBN 9780716718222. OCLC 14967288.CS1 maint: ref=harv (link)
• McKenna, M.C. (1975). "Toward a phylogenetic classification of the Mammalia". In Luckett, W.P.; Szalay, F.S. (eds.). Phylogeny of the primates: a multidisciplinary approach (Proceedings of WennerGren Symposium no. 61, Burg Wartenstein, Austria, July 6–14, 1974). New York: Plenum. pp. 21–46. doi:10.1007/978-1-4684-2166-8_2. ISBN 978-1-4684-2168-2. OCLC 1693999.CS1 maint: ref=harv (link)
• McKenna, Malcolm C.; Bell, Susan K. (1997). Classification of Mammals Above the Species Level. New York: Columbia University Press. ISBN 0231110138. OCLC 37345734.CS1 maint: ref=harv (link)