A new theropod (Dinosauria) from the Huincul Formation (Late Cretaceous) of north Patagonia, Argentina

The theropod diversity of the Huincul Formation (Neuquén Group) includes the abelisaurids Ilokelesia and Skorpiovenator, and the carcharodontosaurid Mapusaurus. Here we report the remains of a recently collected theropod specimen (MOZ-PV-7200) from sediments assigned to this unit, which consists in...

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Detalles Bibliográficos
Autores principales: Coria, Rodolfo, Carabajal, Ariana Paulina
Formato: Objeto de conferencia Resumen
Lenguaje:Inglés
Publicado: 2010
Materias:
Ciencias Naturales
Paleontología
Patagonia (Argentina)
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/16844
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-16844
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Paleontología
Patagonia (Argentina)
spellingShingle Ciencias Naturales
Paleontología
Patagonia (Argentina)
Coria, Rodolfo
Carabajal, Ariana Paulina
A new theropod (Dinosauria) from the Huincul Formation (Late Cretaceous) of north Patagonia, Argentina
topic_facet Ciencias Naturales
Paleontología
Patagonia (Argentina)
description The theropod diversity of the Huincul Formation (Neuquén Group) includes the abelisaurids Ilokelesia and Skorpiovenator, and the carcharodontosaurid Mapusaurus. Here we report the remains of a recently collected theropod specimen (MOZ-PV-7200) from sediments assigned to this unit, which consists in 14 vertebral elements (including fragments of cervical, 2 complete dorsals, several isolated dorsal centra, one complete anterior caudal, one anteriormid caudal haemal arch, and several isolated caudal centra), a sacrum formed by 5 fused vertebrae and two isolated sacral centra, a complete right ilium and both pubes lacking the distal foot. The remains represent a mediun size, sub-adult specimen that exhibit some features that have not been described in any other previously recorded theropod form, such as a long preacetabular process of the ilium strongly projected ventrally beyond the distal end of the pubic peduncle. The presence of sacral neural spines completely fused to each other in a single longitudinal bone-sheet has been observed in the noasaurid Masiakasaurus. An ilium with a squared outlined postacetabular process with a concave distal border is a character present in most abelisaurids like Carnotaurus, Aucasaurus and Majungasaurus. Some morphological elements of the pubis remind the putative noasaurid Bahariasaurus, although further comparisons are difficult due the lost of the type specimen of this African form. By other hand, the absence of lateral pleurocoels in dorsal vertebrae reminds the condition observed in Ilokelesia aguadagrandensis Coria and Salgado. However, the sacrum formed by 5 fused elements with its centra dorsoventrally depressed and laterally wide, pubis with anteroposteriorly narrow shafts and opened obturator notch, and the absence of fusion between ilium and pubis are plesiomorphic stages for abelisaurids. The cladistic analysis currently conducted will shed light on the phylogenetical and taxonomical implications of this new specimen on the theropod diversity of the Huincul Formation.
format Objeto de conferencia
Resumen
author Coria, Rodolfo
Carabajal, Ariana Paulina
author_facet Coria, Rodolfo
Carabajal, Ariana Paulina
author_sort Coria, Rodolfo
title A new theropod (Dinosauria) from the Huincul Formation (Late Cretaceous) of north Patagonia, Argentina
title_short A new theropod (Dinosauria) from the Huincul Formation (Late Cretaceous) of north Patagonia, Argentina
title_full A new theropod (Dinosauria) from the Huincul Formation (Late Cretaceous) of north Patagonia, Argentina
title_fullStr A new theropod (Dinosauria) from the Huincul Formation (Late Cretaceous) of north Patagonia, Argentina
title_full_unstemmed A new theropod (Dinosauria) from the Huincul Formation (Late Cretaceous) of north Patagonia, Argentina
title_sort new theropod (dinosauria) from the huincul formation (late cretaceous) of north patagonia, argentina
publishDate 2010
url http://sedici.unlp.edu.ar/handle/10915/16844
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