Laurasiatheria

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Laurasiatheria
Temporal range: Paleocene–Recent
Laurasiatheria.jpg
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Magnorder: Boreoeutheria
Superorder: Laurasiatheria
Waddell et al., 1999[1]
Subgroups
Synonyms
  • Laurasiaplacentalia (Arnason, 2008)[2]
  • Hoplopoda (Goldfuss, 1820)

Laurasiatheria ("laurasian beasts") is a superorder of placental mammals that groups together order Eulipotyphla and clade Scrotifera.[1][3][4] It is a sister group to Euarchontoglires with which it forms the magnorder Boreoeutheria. Laurasiatheria was discovered on the basis of the similar gene sequences shared by the mammals belonging to it; no anatomical features have yet been found that unite the group. The Laurasiatheria clade is based on DNA sequence analyses and retrotransposon presence/absence data. The superorder originated on the northern supercontinent of Laurasia, after it split from Gondwana when Pangaea broke up.[1] Its last common ancestor is supposed to have diversified ca. 76[5] to 90[6] million years ago.

Etymology[]

The name of this superorder comes from the theory that these mammals evolved on the supercontinent of Laurasia.[1] In contrast, extinct primitive mammals called Gondwanatheria existed in the supercontinent of Gondwana.

Classification and phylogeny[]

Uncertainty still exists regarding the phylogenetic tree for extant laurasiatherians, primarily due to disagreement about the placement of orders Chiroptera and Perissodactyla. Based on morphological grounds, bats (order Chiroptera) had long been classified in the superorder Archonta (e.g. along with primates, treeshrews and the gliding colugos) until genetic research instead showed their kinship with the other laurasiatheres.[7] The studies conflicted in terms of the exact placement of Chiroptera, however, with it being linked most closely to groups such as order Eulipotyphla in the clade . Two 2013 studies retrieve that bats, carnivorans and euungulates form a clade Scrotifera, therefore involving that Eulipotyphla might be a basal group to all other Laurasiatheria taxa.[8][9]

Phylogeny within superorder Laurasiatheria[10][6][11][12][13]
 Placentalia 
 

Atlantogenata Elephas africanus - 1700-1880 - Print - Iconographia Zoologica - (white background).jpg

 
 Boreoeutheria 
 

Euarchontoglires Bruno Liljefors - Hare studies 1885 white background.jpg

 
 Laurasiatheria 
 Eulipotyphla 
 

Erinaceus europaeus - 1700-1880 - Print - Iconographia Zoologica - Special Collections University of Amsterdam -(white background).jpg

 
 

Solenodon paradoxus (Plate 2) (white background).jpg

 
 
 Scrotifera 
 

Chiroptera Braunes Langohr (Plectus auritus).jpg

 
 

Ferungulata Dogs, jackals, wolves, and foxes (Plate XI).jpg

 
 
 
 
 
The cladogram has been reconstructed from mitochondrial and nuclear DNA and protein characters, as well as the fossil record.

Laurasiatheria is also posited to include several extinct orders and superorders. At least some of these are considered wastebasket taxa, historically lumping together several lineages based on superficial attributes and assumed relations to modern mammals. In some cases, these orders have turned out to either be paraphyletic assemblages, or to be composed of mammals now understood not to be laurasiatheres at all.

  • Condylarthra (paraphyletic in relation to true ungulates, possibly polyphyletic since some forms may be afrotheres or even non-placental eutherians)
  • Creodonta (order closely related to Carnivora, now polyphyletic and split in two orders: Hyaenodonta and Oxyaenodonta)
  • Dinocerata (natural order closely related to perissodactyls)[14]
  • Meridiungulata (Collagen sequences found in Macrauchenia and Toxodon indicate what are now understood to be the sister taxon to perissodactyls, though in 2021 this clade is found to be polyphyletic, with some members being classified as afrotheres)[15]
  • Mesonychia (natural clade, though several members, such as genus Andrewsarchus, are now thought to belong in other groups)

See also[]

References[]

  1. ^ a b c d Waddell, Peter J.; Okada, Norihiro; Hasegawa, Masami (1999). "Towards Resolving the Interordinal Relationships of Placental Mammals". Systematic Biology. 48 (1): 1–5. doi:10.1093/sysbio/48.1.1. PMID 12078634.
  2. ^ Arnason U., Adegoke J. A., Gullberg A., Harley E. H., Janke A., Kullberg M. (2008.) "Mitogenomic relationships of placental mammals and molecular estimates of their divergences." Gene.; 421(1-2):37–51
  3. ^ Nikaido, M.; Rooney, A. P. & Okada, N. (1999). "Phylogenetic relationships among cetartiodactyls based on insertions of short and long interpersed elements: Hippopotamuses are the closest extant relatives of whales". Proceedings of the National Academy of Sciences. 96 (18): 10261–10266. Bibcode:1999PNAS...9610261N. doi:10.1073/pnas.96.18.10261. PMC 17876. PMID 10468596.
  4. ^ Groves, Colin; Grubb, Peter (1 November 2011). Ungulate Taxonomy. JHU Press. p. 27. ISBN 978-1-4214-0093-8. OCLC 708357723.
  5. ^ dos Reis, Mario; Inoue, Jun; Hasegawa, Masami; Asher, Robert J.; Donoghue, Philip C. J.; Yang, Ziheng (2012-09-07). "Phylogenomic datasets provide both precision and accuracy in estimating the timescale of placental mammal phylogeny". Proceedings of the Royal Society B: Biological Sciences. 279 (1742): 3491–3500. doi:10.1098/rspb.2012.0683. ISSN 0962-8452. PMC 3396900. PMID 22628470.
  6. ^ a b Zhou, Xuming; Xu, Shixia; Xu, Junxiao; Chen, Bingyao; Zhou, Kaiya; Yang, Guang (2012-01-01). "Phylogenomic Analysis Resolves the Interordinal Relationships and Rapid Diversification of the Laurasiatherian Mammals". Systematic Biology. 61 (1): 150–64. doi:10.1093/sysbio/syr089. ISSN 1063-5157. PMC 3243735. PMID 21900649.
  7. ^ Pumo, Dorothy E.; Finamore, Peter S.; Franek, William R.; Phillips, Carleton J.; Tarzami, Sima; Balzarano, Darlene (1998). "Complete Mitochondrial Genome of a Neotropical Fruit Bat, Artibeus jamaicensis, and a New Hypothesis of the Relationships of Bats to Other Eutherian Mammals". Journal of Molecular Evolution. 47 (6): 709–717. Bibcode:1998JMolE..47..709P. doi:10.1007/PL00006430. PMID 9847413. S2CID 22900642.
  8. ^ Tsagkogeorga, G; Parker, J; Stupka, E.; Cotton, J. A.; Rossiter, S. J. (2013). "Phylogenomic analyses elucidate the evolutionary relationships of bats". Current Biology. 23 (22): 2262–2267. doi:10.1016/j.cub.2013.09.014. PMID 24184098.
  9. ^ Morgan, C. C.; Foster, P. G.; Webb, A. E.; Pisani, D.; McInerney, J. O.; O'Connell, M. J. (2013). "Heterogeneous models place the root of the placental mammal phylogeny". Molecular Biology and Evolution. 30 (9): 2145–2256. doi:10.1093/molbev/mst117. PMC 3748356. PMID 23813979.
  10. ^ Waddell, Peter J.; Kishino, Hirohisa; Ota, Rissa (2001). "A phylogenetic foundation for comparative mammalian genomics". Genome Informatics. 12: 141–154. PMID 11791233.
  11. ^ O’Leary, M. A., Bloch JI, Flynn, J. J., Gaudin, T. J., Giallombardo, A., Giannini, N. P., Goldber, S. L, Kraatz, B. P., Luo, Z-X, Jin Meng, Xijun Ni, Novacek, M. J., Perini, F. A., Randall, Z. S., Rougier, G. W., Sargis, E. J., Silcox, M. T., Simmons, N. B., Spaulding, M. Velazco, P. M., Weksler, M., Wible, J. R. Cirranello, A. L. (2013.) "The Placental Mammal Ancestor and the Post–K-Pg Radiation of Placentals." Science 339:6120:662-667.
  12. ^ Frank Zachos (2020.) "Mammalian Phylogenetics: A Short Overview of Recent Advances", In book: "Mammals of Europe - Past, Present, and Future" (pp.31-48)
  13. ^ Xue Lv, Jingyang Hu, Yiwen Hu, Yitian Li, Dongming Xu, Oliver A. Ryder, David M. Irwin, Li Yu (2021.) "Diverse phylogenomic datasets uncover a concordant scenario of laurasiatherian interordinal relationships", Molecular Phylogenetics and Evolution, Volume 157
  14. ^ Burger, Benjamin J., (2015.) "The systematic position of the saber-toothed and horned giants of the Eocene: the Uintatheres (order Dinocerata)", Utah State University Uintah Basin Campus, Vernal, Utah
  15. ^ Avilla, Leonardo S.; Mothé, Dimila (2021). "Out of Africa: A New Afrotheria Lineage Rises From Extinct South American Mammals". Frontiers in Ecology and Evolution. 9. doi:10.3389/fevo.2021.654302. ISSN 2296-701X.

Further reading[]

External links[]

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