File:Ptychodus vertebra.PNG

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English: Calcification pattern of the vertebral centra of EMRG-Chond-SK-1. (A) close up view and illustration of the vertebral centra EMRG-Chond-SK-1a. The articular surface is weathered and exposes the inner layer of the vertebrae, showing concentric calcareous rings and parallel bands that run perpendicular to them; (B) vertebral section in transverse plane and illustration of EMRG-Chond-SK-1b show an asterospondylic calcification pattern with four cartilage wedges radiating diagonally from the center to the base of the neural and haemal arches.


Español: Fig. 3. Patrón de calcificación de los centros vertebrales de EMRG-Chond-SK-1.

(A) vista de cerca e ilustración del centro vertebral EMRG-Chond-SK-1a. La superficie articular está desgastada y expone la capa interna de las vértebras, mostrando anillos calcáreos concéntricos y bandas paralelas que corren perpendiculares a ellas;

(B) la sección vertebral en el plano transversal y la ilustración de EMRG-Chond-SK-1b muestran un patrón de calcificación asterospondílica con cuatro cuñas de cartílago que se irradian en diagonal desde el centro hasta la base de los arcos neural y hemal.
Date
Source Articulated remains of the extinct shark Ptychodus (Elasmobranchii, Ptychodontidae) from the Upper Cretaceous of Spain provide insights into gigantism, growth rate and life history of ptychodontid sharks. PLoS ONE 15(4): e0231544.
Author Jambura PL, Kriwet J

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current13:31, 3 May 2020Thumbnail for version as of 13:31, 3 May 20201,940 × 1,798 (3.32 MB)Sanador2.0{{Information |description ={{es|1=Fig. 3. Patrón de calcificación de los centros vertebrales de EMRG-Chond-SK-1.<br> (A) vista de cerca e ilustración del centro vertebral EMRG-Chond-SK-1a. La superficie articular está desgastada y expone la capa interna de las vértebras, mostrando anillos calcáreos concéntricos y bandas paralelas que corren perpendiculares a ellas;<br> (B) la sección vertebral en el plano transversal y la ilustración de EMRG-Chond-SK-1b muestran un patrón de calcificación...

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