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Maxwell-EE_2014_An_evolutionary_and_developmental_perspective_on_the_loss_of_regionalization_in_the_limbs_of_derived_ichthyosaurs_Scheyer-TM.pdf
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🔗 Source: zora.uzh.ch
📊 Size: 1.37 MB
📄 Pages: 18 pages
⬇️ Downloads: 128

Summary

An evolutionary and developmental perspective on the loss of regionalization in the limbs of derived ichthyosaurs. Researchers examined the loss of proximodistal identity in ichthyosaur limbs, including phylogenetic progression, histology, and microstructure. Results show that loss of limb element identity occurred progressively over ichthyosaurian evolution, with notches on the anterior surface of limb elements in derived ichthyosaurs being homologous to long bone shafts in terrestrial tetrapods. A developmental mechanism, gradual expansion of the polyalanine region of HoxD13, is proposed to explain the progressive loss of limb regionalization and heterochronic delay in perichondral ossification.

Description

An evolutionary and developmental perspective on the loss of regionalization in the limbs of derived ichthyosaurs.

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  • File Format: PDF
  • File Size: 1.37 MB
  • Pages: 18
  • Language: EN
  • Total Downloads: 128
  • Last Updated: 6 days ago

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