Patterns of ossification in southern versus northern placental mammals

Show simple item record Hautier, Lionel Bennett, Nigel C., 1961- Viljoen, Hermien Howard, Lauren Milinkovitch, Michel C. Tzika, Athanasia C. Goswami, Anjali Asher, Robert J. 2014-11-07T09:37:34Z 2014-11-07T09:37:34Z 2013-07
dc.description.abstract Consensus on placental mammal phylogeny is fairly recent compared to that for vertebrates as a whole. A stable phylogenetic hypothesis enables investigation into the possibility that placental clades differ from one another in terms of their development. Here, we focus on the sequence of skeletal ossification as a possible source of developmental distinctiveness in “northern” (Laurasiatheria and Euarchontoglires) versus “southern” (Afrotheria and Xenarthra) placental clades. We contribute data on cranial and postcranial ossification events during growth in Afrotheria, including elephants, hyraxes, golden moles, tenrecs, sengis, and aardvarks. We use three different techniques to quantify sequence heterochrony: continuous method, sequence-ANOVA (analysis of variance) and event-paring/Parsimov. We show that afrotherians significantly differ from other placentals by an early ossification of the orbitosphenoid and caudal vertebrae. Our analysis also suggests that both southern placental groups show a greater degree of developmental variability; however, they rarely seem to vary in the same direction, especially regarding the shifts that differ statistically. The latter observation is inconsistent with the Atlantogenata hypothesis in which afrotherians are considered as the sister clade of xenarthrans. Interestingly, ancestral nodes for Laurasiatheria and Euarchontoglires show very similar trends and our results suggest that developmental homogeneity in some ossification sequences may be restricted to northern placental mammals (Boreoeutheria). en_US
dc.description.librarian hj2014 en_US
dc.description.uri en_US
dc.identifier.citation Hautier, L, bennett, NC, Viljoen, H, Howard, L, Milinkovitch, MC, Tzika, AC, Goswami, A & Asher, RJ 2013, 'Patterns of ossification in southern versus northern placental mammals', Evolution, vol. 67, no. 7, pp. 1994-2010. en_US
dc.identifier.issn 0014-3820 (print)
dc.identifier.issn 1558-5646 (online)
dc.identifier.other 10.1111/evo.12071
dc.language.iso en en_US
dc.publisher Wiley en_US
dc.rights © 2013 The Author(s). Evolution © 2013 The Society for the Study of Evolution. This is the pre-peer reviewed version of the following article : Patterns of ossification in southern vs. northern placental mammals, Evolution, vol. 67, no. 7, pp. 1994-2010, 2013, doi : 10.1111/evo.12071. The definite version is available at : en_US
dc.subject Afrotheria en_US
dc.subject Development en_US
dc.subject Evolution en_US
dc.subject Heterochrony en_US
dc.subject Ossification en_US
dc.subject Phylogeny en_US
dc.subject Skeletogenesis en_US
dc.title Patterns of ossification in southern versus northern placental mammals en_US
dc.type Postprint Article en_US

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