Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/14840
Title: Ossification Heterochrony in the Therian Postcranial Skeleton and the Marsupial-Placental Dichotomy
Contributor(s): Weisbecker, Vera (author); Goswami, Anjali (author); Wroe, Stephen  (author)orcid ; Sanchez-Villagra, Marcelo R (author)
Publication Date: 2008
DOI: 10.1111/j.1558-5646.2008.00424.x
Handle Link: https://hdl.handle.net/1959.11/14840
Abstract: Postcranial ossification sequences in 24 therian mammals and three outgroup taxa were obtained using clear staining and computed tomography to test the hypothesis that the marsupial forelimb is developmentally accelerated, and to assess patterns of therian postcranial ossification. Sequence rank variation of individual bones, phylogenetic analysis, and algorithm-based heterochrony optimization using event pairs were employed. Phylogenetic analysis only recovers Marsupialia, Australidelphia, and Eulipotyphla. Little heterochrony is found within marsupials and placentals. However, heterochrony was observed between marsupials and placentals, relating to late ossification in hind limb long bones and early ossification of the anterior axial skeleton. Also, ossification rank position of marsupial forelimb and shoulder girdle elements is more conservative than that of placentals; in placentals the hind limb area is more conservative. The differing ossification patterns in marsupials can be explained with a combination of muscular strain and energy allocation constraints, both resulting from the requirement of active movement of the altricial marsupial neonates toward the teat. Peramelemorphs, which are comparatively passive at birth and include species with relatively derived forelimbs, differ little from other marsupials in ossification sequence. This suggests that ossification heterochrony in marsupials is not directly related to diversity constraints on the marsupial forelimb and shoulder girdle.
Publication Type: Journal Article
Source of Publication: Evolution, 62(8), p. 2027-2041
Publisher: Wiley-Blackwell Publishing Ltd
Place of Publication: United States of America
ISSN: 0014-3820
1558-5646
Field of Research (FOR): 040308 Palaeontology (incl Palynology)
060807 Animal Structure and Function
Socio-Economic Outcome Codes: 970106 Expanding Knowledge in the Biological Sciences
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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