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Osteology of a perinatal aristonectine (Plesiosauria; Elasmosauridae)

Published online by Cambridge University Press:  30 August 2016

José P. O’Gorman ,
Marianella Talevi  and
Marta S. Fernández
José P. O’Gorman*
Affiliation:
División Paleontología Vertebrados, Museo de La Plata, Universidad Nacional de La Plata, Paseo del Bosque s/n, B1900FWA, La Plata, Argentina CONICET, Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina
Marianella Talevi
Affiliation:
CONICET, Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina Instituto de Investigación en Paleobiología y Geología Universidad Nacional de Río Negro-CONICET, Av Roca 1242, R8332EXZ General Roca, Río Negro, Argentina
Marta S. Fernández
Affiliation:
División Paleontología Vertebrados, Museo de La Plata, Universidad Nacional de La Plata, Paseo del Bosque s/n, B1900FWA, La Plata, Argentina CONICET, Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina
*
[email protected]
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Abstract

Perinatal specimens give valuable information about the first stages of vertebrate ontogeny. Here, the morphology and palaeohistology of an aristonectine perinatal specimen from Seymour Island (Isla Marambio), López de Bertodano Formation are analysed. The palaeohistological analysis shows incomplete endochondral ossification (retention of a calcified cartilaginous core in the medullary region), predominance of primary bone tissue without secondary remodelling, lack of primary or secondary osteons and of growth marks in the cortical bone, and open vascular spaces not surrounded by a thin coat of lamellar bone tissue. General lines of morphological changes were inferred from comparing the fossil with an adult aristonectine specimen indicating i) a tendency of relatively high and broad posterior cervicals to decrease during ontogeny, ii) a decrease of relative size of the dorsolateral process and an increase of the glenoid ramus and iii) the existence of two separate stages in propodial growth divided into an initial elongation followed by a distal expansion. The presence of a perinatal specimen in the James Ross Archipelago indicates that the region was used as a breeding area by the aristonectines during the last part of the Cretaceous.

Keywords

Aristonectinaemarine reptileperinatalUpper CretaceousWeddellian Province
Type
Earth Sciences
Information
Antarctic Science , Volume 29 , Issue 1 , February 2017 , pp. 61 - 72
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Copyright
© Antarctic Science Ltd 2016 

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