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  Limb reduction in squamate reptiles correlates with the reduction of the chondrocranium: A case study on serpentiform anguids

Yaryhin, O., Klembara, J., Pichugin, Y., Kaucka, M., & Werneburg, I. (2021). Limb reduction in squamate reptiles correlates with the reduction of the chondrocranium: A case study on serpentiform anguids. Developmental Dynamics, 250(9), 1300-1317. doi:10.1002/dvdy.307.

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Yaryhin, Oleksandr1, Author           
Klembara, Jozef, Author
Pichugin, Yuriy2, Author           
Kaucka, Marketa1, Author           
Werneburg, Ingmar, Author
Affiliations:
1Max Planck Research Group Craniofacial Biology (Kaucka Petersen), Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_3164874              
2Department Evolutionary Theory, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_1445641              

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Free keywords: body elongation, chondrocranium, development, lepidosaurs, limb reduction, limblessness, pleiotropy, reptiles, skull
 Abstract: Abstract Background In vertebrates, the skull evolves from a complex network of dermal bones and cartilage?the latter forming the pharyngeal apparatus and the chondrocranium. Squamates are particularly important in this regard as they maintain at least part of the chondrocranium throughout their whole ontogeny until adulthood. Anguid lizards represent a unique group of squamates, which contains limbed and limbless forms and show conspicuous variation of the adult skull. Results Based on several emboadryonic stages of the limbless lizards Pseudopus apodus and Anguis fragilis, and by comparing with other squamates, we identified and interpreted major differences in chondrocranial anatomy. Among others, the most important differences are in the orbitotemporal region. P. apodus shows a strikingly similar development of this region to other squamates. Unexpectedly, however, A. fragilis differs considerably in the composition of the orbitotemporal region. In addition, A. fragilis retains a paedomorphic state of the nasal region. Conclusions Taxonomic comparisons indicate that even closely related species with reduced limbs show significant differences in chondrocranial anatomy. The Pearson correlation coefficient suggests strong correlation between chondrocranial reduction and limb reduction. We pose the hypothesis that limb reduction could be associated with the reduction in chondrocrania by means of genetic mechanisms.

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Language(s): eng - English
 Dates: 2021-01-142020-06-172021-01-172021-02-152021-09
 Publication Status: Published in print
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 Identifiers: DOI: 10.1002/dvdy.307
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Title: Developmental Dynamics
  Other : Special Issue: Limb development, evolution and regeneration/repair: part one
Source Genre: Journal
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Publ. Info: New York, NY : John Wiley & Sons
Pages: - Volume / Issue: 250 (9) Sequence Number: - Start / End Page: 1300 - 1317 Identifier: ISSN: 1058-8388
CoNE: https://pure.mpg.de/cone/journals/resource/954927516528