کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4746959 1642067 2015 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
First record of Polycotylidae (Sauropterygia, plesiosauria) from the Upper Cretaceous of Antarctica
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فسیل شناسی
پیش نمایش صفحه اول مقاله
First record of Polycotylidae (Sauropterygia, plesiosauria) from the Upper Cretaceous of Antarctica
چکیده انگلیسی
In the present paper we report the incomplete skeleton of an indeterminate polycotylid that includes the articulated pelvic girdle. The material was collected from the Alpha Member of the Santa Marta Formation (upper Coniacian-lower Campanian) on James Ross Island, Antarctic Peninsula. The specimen is referred to the Polycotylidae on the basis of its very elongate ischia and rimmed anterior and posterior articular surfaces of the dorsal vertebrae. Additionally, the caudal vertebrae show confluent parapophyses and neural arch facets. The present report constitutes the first record for polycotylids in Antarctica, being an important addition to the fossil marine reptile diversity. Polycotylids are a scarce component of the Weddellian herpetofauna, which are dominated by aristonectine and non-aristonectine elasmosaurids. In contrast, in Northern Hemisphere assemblages, polycotylids are an important component of the plesiosaur diversity. The scarcity of polycotylids may constitute another distinctive feature of Weddellian plesiosaur faunas.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cretaceous Research - Volume 56, September–December 2015, Pages 563-568
نویسندگان
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