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Rise of vertebral centra in evolution of different vertebrates

Vestnik Leningrad Univ Ser Biol 21(3): 16-22
Rise of vertebral centra in evolution of different vertebrates
The absence of the vertebral centra in some modern representatives of chondral and bony fishes, certain structural peculiarities of the vertebral column in some modern sharks as well as some palaeontological data suggest that the centra of chondral and bony fishes are not homologous. The absence of the chondral stage during the ontogeny of the centra in Actinopterygii is regarded as the reflection of phylogenetic development of these elements of the vertebral column. Thus, the centra of Actinopterygii did not pass the chondral stage in their phylogenetic development and arose as bony formations at once. The absence of the cartilage which serves as a mechanical basis for the developing bones of the endoskeleton could not impede the rise of the centra, because in this case chorda carried out the function of the mechanical basis. Among bony fishes vertebral centra apparently arose independently in all 3 large groups[long dash]Actinopterygii, Dipnoi and Crossopterygii. The bony centra of Crossopterygii and ancient Tetrapoda possibly arose without the chondral stage.

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Accession: 025409493

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