Laurasiatheria
Laurasiatheria Temporal range: Late Cretaceous - Recent | |
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Clockwise from the upper left: giraffe, golden crown fruit bat, lion, hedgehog | |
Scientific classification | |
Domain: | Eukarya |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Mammalia |
Subclass: | Theria |
Infraclass: | Eutheria |
(unranked): | Exafroplacentalia |
Magnorder: | Boreoeutheria |
Superorder: | Laurasiatheria Waddell et al., 1999[1] |
Orders | |
Laurasiatheria is a superorder of placental mammals believed to have originated on the northern supercontinent of Laurasia. The superorder includes shrews, pangolins, bats, whales, carnivorans, odd-toed and even-toed ungulates, among others.
Classification and phylogeny
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. Laurasiatheria is a clade usually discussed without a Linnaean rank, but has been assigned the rank of cohort or magnorder, and superorder. The Laurasiatheria clade is based on DNA sequence analyses and retrotransposon presence/absence data. The name comes from the theory that these mammals evolved on the supercontinent of Laurasia, after it split from Gondwana when Pangaea broke up. It is a sister group to Euarchontoglires (or Supraprimates) with which it forms the clade Boreoeutheria. Laurasiatheria includes the following extant taxa:
- Eulipotyphla, having subsumed:
- Erinaceomorpha: hedgehogs and gymnures (see Erinaceidae)
- the remaining families of Soricomorpha: moles, shrews, solenodons (cosmopolitan distribution)
- Chiroptera: bats (cosmopolitan)
- Perissodactyla: odd-toed ungulates including horses, tapirs and rhinoceroses
- Artiodactyla: even-toed ungulates including camels, pigs, ruminants (giraffes, deer, antelopes, cattle, sheep, goats, etc.), hippopotamuses and cetaceans[2][3]
- Cetacea: whales, dolphins, and porpoises
- Ferae (unranked) containing the orders:
Uncertainty still exists regarding the phylogenetic tree for extant laurasiatherians, primarily due to disagreement about the placement of Chiroptera and Perissodactyla. Based on morphological grounds, Chiroptera had long been classified in the superorder Archonta (e.g. along with treeshrews and the gliding colugos) until genetic research instead showed their kinship with the other laurasiatherians.[4] The studies conflicted in terms of the exact placement of Chiroptera, however, with it being linked most closely to groups such as Eulipotyphla,[5] Ferae[6] or with Perissodactyla and Ferae in the Pegasoferae proposal.[7] A recent study (Zhou et al., 2011[8]) found that "trees reconstructed [...] for the 1,608-gene data set fully support [...] a basal position for Eulipotyphla and a more apical position for Chiroptera" (see cladogram below) and concluded that "Pegasoferae [...] does [sic] not appear to be a natural group." The most recent study (Nery et al., 2012[9]) supports the conclusions of Zhou et al. using a large genomic dataset, placing Eulipotyphla as a basal order and Chiroptera as sister to Cetartiodactyla, with maximal support for all nodes of their phylogenetic tree. The exact position of Perissodactyla remains less certain, with some studies linking it with Ferae into a proposed clade Zooamata while others unite it with Cetartiodactyla into Euungulata, a clade of 'true ungulates'; Zhou et al. found better (but not full) support for the latter, while Nery et al. found Perissodactyla to be sister to Carnivora.
Laurasiatheria |
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Laurasiatheria is also posited to include several extinct orders and superorders. At least some of these are considered wastebasket taxons, 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.
- Meridiungulata (possibly polyphyletic; Liptopterna and Notoungulata are now understood to be stem-perissodactyls, but other clades like Astrapotheria may be unrelated.)
- Condylarthra (paraphyletic in relation to true ungulates, possibly polyphyletic since some forms may be afrotheres or even non-placental eutherians)
- Dinocerata (natural clade closely related to perissodactyls and meridiungulates)[10]
- Mesonychia (natural clade, though several members, such as Andrewsarchus, are now thought to belong in other groups)
- Creodonta (polyphyletic, composed almost entirely of several unrelated clades of laurasiatheres and afrotheres)
- Desmostylia (natural clade, historically considered afrotheres but now understood to be stem-perissodactyls)
References
- ↑ Waddell, Peter J.; Okada, Norohiro; 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.
- ↑ 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. doi:10.1073/pnas.96.18.10261. PMC 17876. PMID 10468596. Retrieved 3 October 2011.
- ↑ Groves, Colin; Grubb, Peter (1 November 2011). Ungulate Taxonomy. JHU Press. p. 27. ISBN 978-1-4214-0093-8. OCLC 708357723.
- ↑ 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. doi:10.1007/PL00006430. PMID 9847413.
- ↑ Cao, Ying; Fujiwara, Miyako; Nikaido, Masato; Okada, Norihiro; Hasegawa, Masami (2000). "Interordinal relationships and timescale of eutherian evolution as inferred from mitochondrial genome data". Gene 259 (1–2): 149–158. doi:10.1016/S0378-1119(00)00427-3. PMID 11163972.
- ↑ Matthee, Conrad A.; Eick, Geeta; Willows-Munro, Sandi; Montgelard, Claudine; Pardini, Amanda T.; Robinson, Terence J. (2007). "Indel evolution of mammalian introns and the utility of non-coding nuclear markers in eutherian phylogenetics". Molecular Phylogenetics and Evolution 42 (3): 827–837. doi:10.1016/j.ympev.2006.10.002. PMID 17101283.
- ↑ Nishihara, H.; Hasegawa, M.; Okada, N. (2006). "Pegasoferae, an unexpected mammalian clade revealed by tracking ancient retroposon insertions". Proceedings of the National Academy of Sciences 103 (26): 9929–9934. doi:10.1073/pnas.0603797103. PMC 1479866. PMID 16785431.
- ↑ Zhou, Xuming; Xu, Shixia; Xu, Junxiao; Chen, Bingyao; Zhou, Kaiya; Yang, Guang (2011). "Phylogenomic Analysis Resolves the Interordinal Relationships and Rapid Diversification of the Laurasiatherian Mammals". Systematic Biology 61 (1): 150–164. doi:10.1093/sysbio/syr089. PMC 3243735. PMID 21900649.
- ↑ Nery, M. F.; González, D. M. J.; Hoffmann, F. G.; Opazo, J. C. (2012). "Resolution of the laurasiatherian phylogeny: Evidence from genomic data". Molecular Phylogenetics and Evolution 64 (3): 685–689. doi:10.1016/j.ympev.2012.04.012. PMID 22560954.
- ↑ BURGER, Benjamin J., THE SYSTEMATIC POSITION OF THE SABER-TOOTHED AND HORNED GIANTS OF THE EOCENE: THE UINTATHERES (ORDER DINOCERATA), Utah State University Uintah Basin Campus, Vernal, UT, United States of America, 84078 , SVP 2015
Further reading
- Churakov, G.; Kriegs, J. O.; Baertsch, R.; Zemann, A.; Brosius, J. R.; Schmitz, J. R. (2009). "Mosaic retroposon insertion patterns in placental mammals". Genome Research 19 (5): 868–875. doi:10.1101/gr.090647.108. PMC 2675975. PMID 19261842.
- Goloboff, Pablo A.; Catalano, Santiago A.; Mirande, J. Marcos; Szumik, Claudia A.; Arias, J. Salvador; Källersjö, Mari; Farris, James S. (2009). "Phylogenetic analysis of 73 060 taxa corroborates major eukaryotic groups". Cladistics 25 (3): 211–230. doi:10.1111/j.1096-0031.2009.00255.x.
- Kitazoe, Yasuhiro; Kishino, Hirohisa; Waddell, Peter J.; Nakajima, Noriaki; Okabayashi, Takahisa; Watabe, Teruaki; Okuhara, Yoshiyasu (2007). Hahn, Matthew, ed. "Robust Time Estimation Reconciles Views of the Antiquity of Placental Mammals". PLoS ONE 2 (4): e384. doi:10.1371/journal.pone.0000384. PMC 1849890. PMID 17440620.
- Kriegs, Jan Ole; Churakov, Gennady; Kiefmann, Martin; Jordan, Ursula; Brosius, Jürgen; Schmitz, Jürgen (2006). "Retroposed Elements as Archives for the Evolutionary History of Placental Mammals". PLoS Biology 4 (4): e91. doi:10.1371/journal.pbio.0040091. PMC 1395351. PMID 16515367.
- Murphy, William J.; Eizirik, Eduardo; O'Brien, Stephen J.; Madsen, Ole; Scally, Mark; Douady, Christophe J.; Teeling, Emma; Ryder, Oliver A.; Stanhope, Michael J.; de Jong, Wilfried W.; Springer, Mark S. (2001). "Resolution of the Early Placental Mammal Radiation Using Bayesian Phylogenetics". Science 294 (5550): 2348–2351. doi:10.1126/science.1067179. PMID 11743200.
- Nikolaev, Sergey; Montoya-Burgos, Juan I.; Margulies, Elliott H.; NISC Comparative Sequencing Program; Rougemont, Jacques; Nyffeler, Bruno; Antonarakis, Stylianos E. (2007). "Early History of Mammals is Elucidated with the ENCODE Multiple Species Sequencing Data". PLoS Genetics 3 (1): e2. doi:10.1371/journal.pgen.0030002. PMC 1761045. PMID 17206863.
- Springer, Mark S.; Murphy, William J.; Eizirik, Eduardo; O'Brien, Stephen J. (2003). "Placental mammal diversification and the Cretaceous–Tertiary boundary". Proceedings of the National Academy of Sciences 100 (3): 1056–1061. doi:10.1073/pnas.0334222100. PMC 298725. PMID 12552136.
- Waddell, Peter J.; Kishino, Hirohisa; Ota, Rissa (2001). "A phylogenetic foundation for comparative mammalian genomics". Genome Informatics 12: 141–154. PMID 11791233.
- Wildman, Derek E.; Chen, Caoyi; Erez, Offer; Grossman, Lawrence I.; Goodman, Morris; Romero, Roberto (2006). "Evolution of the mammalian placenta revealed by phylogenetic analysis". Proceedings of the National Academy of Sciences 103 (9): 3203–3208. doi:10.1073/pnas.0511344103. PMC 1413940. PMID 16492730.
External links
- Data related to Laurasiatheria at Wikispecies
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