Meridiungulata is an extinct clade with the rank of cohort or superorder, containing the South American ungulates Pyrotheria possibly including Xenungulata, Astrapotheria, Notoungulata and Litopterna It is not known if it is a natural group; it was erected to distinguish the ungulates of South America from other ungulates Relationships between the orders inside Meridiungulata remain unresolved and it could well be a 'wastebasket' taxon Most Meridiungulata died out following the invasion of South America by North American ungulates and predators during the Great American Interchange; a few of the largest species of notoungulates and litopterns survived until the end-Pleistocene extinctions
- 1 Taxonomy
- 2 Classification
- 3 Notes
- 4 References
Meridiungulata might have originated in South America from a North American condylarth ancestor, and they may be members of the clade Laurasiatheria, related to other ungulates, including artiodactyls and perissodactyls It has, however, been suggested the Meridiungulata are part of a different macro-group of placental mammals called Atlantogenata
Much of the evolution of meridiungulates occurred in isolation from other ungulates, a great example of convergent evolution However, the argument that meridiungulates are related to artiodactyls and perissodactyls needs support from molecular sequencing Some paleontologists have also challenged the monophyly of Meridiungulata by suggesting that the pyrotheres are more closely related to other mammals, such as Embrithopoda an African order possibly related to elephants, than to other South American ungulates
Results from the sequencing of collagen from Pleistocene fossils of the notoungulate Toxodon and the litoptern Macrauchenia have indicated that at least these two orders are indeed laurasiatheres, and so form a sister group to odd-toed ungulates This result has been corroborated with mitochondrial DNA extracted from Macrauchenia, which points towards a branching date of 66 million years ago Panperissodactyla has been proposed as the name of an unranked clade to include perissodactyls and their extinct South American ungulate relatives
ClassificationAstrapotherium magnum skull
The following classification is from Rose 2006:
- †Didolodus incertae sedis
- Amilnedwardsia Notopterna
- Order †Notoungulata
- Suborder †Notioprogonia
- Suborder †Toxodontia
- Suborder Typotheria
- Suborder Hegetotheria Typotheria
- Suborder †Notioprogonia
- Order †Litopterna Panameriungulata
- †Notonychopidae Notopterna
- Order †Astrapotheria
- †Trigonostylopidae Trigonostylopoidae
- Order †Pyrotheria
- Order †Xenungulata
- ^ Muizon & Cifelli 2000
- ^ Hunter & Janis 2006
- ^ Naish 2008
- ^ Shockey & Anaya 2004
- ^ a b Welker et al 2015
- ^ Buckley 2015
- ^ Westbury et al 2017
- Buckley, M 2015-04-01 "Ancient collagen reveals evolutionary history of the endemic South American 'ungulates'" Proceedings of the Royal Society B: Biological Sciences 282 1806: 20142671–20142671 doi:101098/rspb20142671 PMC 4426609
- Hunter, JP; Janis, CM 2006 "Spiny Norman in the Garden of Eden Dispersal and early biogeography of Placentalia" Journal of Mammalian Evolution 13 2: 89–123 doi:101007/s10914-006-9006-6 OCLC 4669969299
- McKenna, MC 1975 "Toward a phylogenetic classification of the Mammalia" In Luckett, WP; Szalay, FS 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:101007/978-1-4684-2166-8_2 ISBN 978-1-4684-2168-2
- Muizon, C de; Cifelli, RL 2000 "The "condylarths" archaic Ungulata, Mammalia from the early Paleocene of Tiupampa Bolivia: implications on the origin of the South American ungulates" Geodiversitas 22 1: 47–150 Retrieved 30 June 2017
- Naish, Darren 2008-02-08 "Snorki the giant's friends and relatives" Tetrapod Zoology Archived from the original on 21 May 2013 Retrieved 2014-10-07
- Rose, Kenneth David 2006 The beginning of the age of mammals Baltimore: JHU Press ISBN 0801884721
- Shockey, BJ; Anaya, F 2004 "Pyrotherium macfaddeni, sp nov late Oligocene, Bolivia and the pedal morphology of pyrotheres" Journal of Vertebrate Paleontology 24 2: 481–488 doi:101671/2521
- Welker, F; Collins, M J; Thomas, J A; Wadsley, M; Brace, S; Cappellini, E; Turvey, S T; Reguero, M; Gelfo, J N; Kramarz, A; Burger, J; Thomas-Oates, J; Ashford, D A; Ashton, P D; Rowsell, K; Porter, D M; Kessler, B; Fischer, R; Baessmann, C; Kaspar, S; Olsen, J V; Kiley, P; Elliott, J A; Kelstrup, C D; Mullin, V; Hofreiter, M; Willerslev, E; Hublin, J-J; Orlando, L; Barnes, I; MacPhee, R D E 2015-03-18 "Ancient proteins resolve the evolutionary history of Darwin's South American ungulates" Nature 522: 81–84 doi:101038/nature14249 ISSN 0028-0836 PMID 25799987
- Westbury, M; Baleka, S; Barlow, A; Hartmann, S; Paijmans, J L A; Kramarz, A; Forasiepi, A M; Bond, M; Gelfo, J N; Reguero, M A; López-Mendoza, P; Taglioretti, M; Scaglia, F; Rinderknecht, A; Jones, W; Mena, F; Billet, G; de Muizon, C; Aguilar, J L; MacPhee, R D E; Hofreiter, M 2017-06-27 "A mitogenomic timetree for Darwin's enigmatic South American mammal Macrauchenia patachonica" Nature Communications 8: 15951 doi:101038/ncomms15951
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