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Antarctic Elasmosaur



Not dinos, but of some particular interest tro many list members, as well
as of ecological interest:

Fostowicz-Frelik, £. and Ga?dzicki, A. 2001. Anatomy and histology of
plesiosaur bones from the Late Cretaceous of Seymour Island, Antarctic
Peninsula. In: A. Ga?dzicki (ed.), Palaeontological Results of the Polish
Antarctic Expeditions. Part III. _Palaeontologia Polonica_ 60: 7?32. 

Abstract: 

"Remains of elasmosaurid plesiosaur have been collected from the lower
part of the Late Cretaceous López de Bertodano Formation on Seymour
Island, Antarctica. This well preserved bone material includes pectoral,
dorsal, and caudal vertebral centra, femur, tibia, and fragments of the
humerus, scapula, and ischia, that most probably belong to the one
specimen. The microstructure of the bone tissue shows rather dense
structure with Haversian remodelling well underway and the areas of
intensive growth, suggesting subadult stage of ontogeny. The dense
pachyostotic character of the rib and girdle tissue, together with a
relative small size of the bones (approximated length of the animal about
two meters) may indicate that described material belongs to the not fully
grown elasmosaur, which may have lived in shallow water environment. The
studied remains share some similarities with those of Mauisaurus from the
Maastrichtian of New Zealand ? in the articular surface of the vertebral
centra and the shape of the tibia."

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