+ Translate

Rise of vertebral centra in evolution of different vertebrates

, : Rise of vertebral centra in evolution of different vertebrates. Vestnik Leningrad Univ Ser Biol 21(3): 16-22

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.

(PDF 0-2 workdays service)

Order PDF Full Text


Click here to order any other PDF Full Text

Accession: 025409493

Submit PDF Full Text: Here

Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:

Other references

Drager, L.F.; Silva, Hélio.Bernardes.; Bortolotto, L.A., 2005: Increased arterial distensibility and renovascular hypertension in Goldenhar syndrome. This is a report of the successful angioplastic treatment of an association of renovascular hypertension with renal artery stenosis and the Goldenhar syndrome (a variant of oculoauriculovertebral dysplasia). For the first time to date, this associ...

Sarajew, A., 1954: Cultivation of Newcastle disease virus and of influenza virus in symbiosis with yeasts at low temperatures. Following the work of Degkwitz (1927), who cultivated measles virus in the presence of certain pneumococci and streptococci, and Silber, who demonstrated that fowl pox virus lived and multiplied in yeast cells, S. cultivated Newcastle disease viru...

Roveda, G.; Salvatierra, C.; Villaneda, E.; Aguilera, E., 1998: Trends in vegetation cover and land use by digital processing of satellite images in La Mojana, Colombia. La Mojana region is located in the North Coast of Colombia. It is part of the alluvial extensive plain, where the Cauca, San Jorge and Magdalena rivers flow together. The region is representative of the tropical humid forest, and is affected by an...

Wetekam W.; Deeley R.G.; Mullinix K.P.; Gordon J.I.; Meyers M.; Kent K.A.; Goldberger R.F., 1976: Effect of estrogen on gene expression vitellogenin synthesis may be regulated at the level of both transcription and translation. Nierlich, Donald P , W J Rutter And C Fred Fox (Ed ) Icn-Ucla Symposia on Molecular And Cellular Biology, Vol V Molecular Mechanisms in The Control Of Gene Expression Keystone, Colo , Usa, March 21-26, Xi+655p Illus Academic Press, Inc : New York, N Y , Usa; London, England Isbn 0-12-518550-2 349-354

Wu, L.-Min; Chen, G.-Wen; Liu, D.-Zeng, 2010: Karyotype Analysis of the Dugesia japonica from Tongbai County in Henan Province, China. The chromosome numbers and karyotypes of the freshwater planarians, Dugesia japonica, from Xiahushan and Panguxi in Tongbai County, Henan Province were studied by air-drying method. The results showed that D. japonica collected from Xiahushan had...

Dorsch Joachim, 2005: Johannes Walther's ideas regarding the training of pre-college geology teachers. Johannes Walther (1860-1937), eminent sedimentologist and paleoecologist, devoted a considerable portion of his time to geoscience education. He was especially engaged in making detailed recommendations for reforming science education at German sc...

Hill, H.F.; Hill, A.G.; Mowat, A.G.; Ansell, B.M.; Mathews, J.A.; Seifert, M.H.; Gumpel, J.M.; Christie, G.A., 1974: Naproxen. A new non-hormonal anti-inflammatory agent. Studies in rheumatoid arthritis. Annals of the Rheumatic Diseases 33(1): 12-19

van Hecke, A., 1978: An observation on the herpetofauna of Chalkidiki northern Greece. Lacerta, 372: 26-30

Fröhlich, H.; Gotzen, L.; Adam, U., 1980: Evaluation of stressed roentgenograms of the ankle joint. An objective criterion to demonstrate the rupture of a ligament of the ankle joint is the radiological visualization of ligamentary instability. A simple jig to obtain a-p [anterior-posterior] and frontal roentgenograms of stressed ankle joint was...

Bruner, L.J., 1970: Blocking phenomena and charge transport through membranes. Biophysik 6(3): 241-256