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Urodelans, Ichthyostega and the origin of the tetrapod limb.

Authors :
Mednikov, D.
Source :
Paleontological Journal; Dec2014, Vol. 48 Issue 10, p1092-1103, 12p
Publication Year :
2014

Abstract

Available information on the development of primitive urodele (Hynobiidae) limbs and limb structure in Devonian tetrapods provide the basis for formulating the hypothesis on the existence of a special phase, the phase of the biserial limb in tetrapod history. The limb of the Devonian amphibian Ichthyostega with two groups of digits, preaxial and postaxial, corresponds well to this phase. Based on the structure of the Ichthyostega limb, it is suggested that the fin type ancestral to terrestrial limbs was asymmetrical biserial, possessed a short axis, unbranched jointed preaxial radials deviating one by one from each mesomere of the axis, and unbranched jointed postaxial radials deviating from the distal mesomeres of the axis in two or more radials. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00310301
Volume :
48
Issue :
10
Database :
Complementary Index
Journal :
Paleontological Journal
Publication Type :
Academic Journal
Accession number :
99777707
Full Text :
https://doi.org/10.1134/S0031030114100074