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Chondrogenic and ossification patterns and sequences in White’s skink Liopholis whitii (Scincidae, Reptilia)


Hugi, J; Mitgutsch, C; Sánchez-Villagra, M R (2010). Chondrogenic and ossification patterns and sequences in White’s skink Liopholis whitii (Scincidae, Reptilia). Zoosystematics and evolution, 86(1):21-32.

Abstract

The prenatal patterns and sequences of chondrogenesis and ossification are described for the skink Liopholis whitii; eight embryos and one adult specimen were examined. Cranial ossification begins in elements of the braincase and the palate, followed by areas of the lower jaw and the cranial roof. Ossification proceeds anteroposteriorly along the axial skeleton and from proximal to distal in the forelimbs and hind limbs. In the zeugopods, the ossification progresses from posterior to anterior, while there is also a strict postaxial order in the autopods with the predominance of digit III in the forelimb and digit IV in the hind limb. Ossification of the femur and tibia starts before the corresponding elements of the forelimb, but simultaneously with the onset in clavicles. Elements of the hind limb display advanced ossification with respect to their forelimb counterparts, with earlier uptake of Alizarin Red in the tarsals, metatarsals and phalanges. The preaxial area of the fused stragalocalcaneum-complex is first to begin ossification among the tarsals. The sequence of ossification is mostly conserved in the skeleton of squamates, as shown in a comparative analysis of heterochrony, but some shifts were found in cranial, vertebral and autopodial regions.

Abstract

The prenatal patterns and sequences of chondrogenesis and ossification are described for the skink Liopholis whitii; eight embryos and one adult specimen were examined. Cranial ossification begins in elements of the braincase and the palate, followed by areas of the lower jaw and the cranial roof. Ossification proceeds anteroposteriorly along the axial skeleton and from proximal to distal in the forelimbs and hind limbs. In the zeugopods, the ossification progresses from posterior to anterior, while there is also a strict postaxial order in the autopods with the predominance of digit III in the forelimb and digit IV in the hind limb. Ossification of the femur and tibia starts before the corresponding elements of the forelimb, but simultaneously with the onset in clavicles. Elements of the hind limb display advanced ossification with respect to their forelimb counterparts, with earlier uptake of Alizarin Red in the tarsals, metatarsals and phalanges. The preaxial area of the fused stragalocalcaneum-complex is first to begin ossification among the tarsals. The sequence of ossification is mostly conserved in the skeleton of squamates, as shown in a comparative analysis of heterochrony, but some shifts were found in cranial, vertebral and autopodial regions.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Paleontological Institute and Museum
Dewey Decimal Classification:560 Fossils & prehistoric life
Uncontrolled Keywords:lizard heterochrony chondrification skeletogenesis cranium postcranium
Language:English
Date:17 March 2010
Deposited On:18 Mar 2010 14:19
Last Modified:05 Apr 2016 14:03
Publisher:Wiley-Blackwell
ISSN:1435-1935
Publisher DOI:https://doi.org/10.1002/zoos.200900011

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