Morphometrics of teropodomorph isolated teeth material from Bauru Basin (Upper Cretaceous, Southeast Brazil)

The theropod material of the Bauru Basin consists mainly of isolated teeth, bone elements being rare, generally isolated and fragmented. The best known theropod of the unity is Pycnonemosaurus nevesi, an abelisaurid described based on some fragmented elements. An ungeal phalanx, which possesses feat...

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Autores principales: Ghilardi, A. M., Pimenta, Bernardo, Fernandes, Marcelo A.
Formato: Objeto de conferencia Resumen
Lenguaje:Inglés
Publicado: 2010
Materias:
Ciencias Naturales
Paleontología
Theropod
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/16884
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-16884
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
Theropod
spellingShingle Ciencias Naturales
Paleontología
Theropod
Ghilardi, A. M.
Pimenta, Bernardo
Fernandes, Marcelo A.
Morphometrics of teropodomorph isolated teeth material from Bauru Basin (Upper Cretaceous, Southeast Brazil)
topic_facet Ciencias Naturales
Paleontología
Theropod
description The theropod material of the Bauru Basin consists mainly of isolated teeth, bone elements being rare, generally isolated and fragmented. The best known theropod of the unity is Pycnonemosaurus nevesi, an abelisaurid described based on some fragmented elements. An ungeal phalanx, which possesses features found in derived maniraptorans, and a scapula associated with non-avialan mariraptorans have also been recovered from this basin. The rest of the bone material collected does not show diagnostic features. Regarding the isolated teeth, many studies have been conducted to increase the taxonomic knowledge of the Bauru theropods. These works, however, have fundamentally considered qualitative (or non-measurable) characters, like general shape or presence/absence of structures. Under these circumstances the material showed affinities to Abelisauroidea, Carcharodontosauridae and Maniraptora. Nevertheless, the evaluation of dental characters from theropod dinosaurs in terms of taxonomic identification remains controversial. Although the methodology is considered relatively efficient concerning small theropods, its effectiveness on other theropod groups is questionable. The dental morphology can vary by position in the mouth and some characters considered as diagnostic, could be, in fact, shared among taxa. The present work aimed, based on a combination of measures of the teeth (crown length, base length and width, density of denticles and derived variables like, squatness and apex location with respect to base), to obtain taxonomic sorting of the isolated material, according to a quantitative methodology. By means of multivariate analysis it was possible to recognize statistically distinct groups. We used measures of teeth associated with cranial material already been published of a variety of theropod groups, to compare with our data. In some cases, similarities could be found, while other morphotypes were completely different. We believe that this methodology offer a more reliable tool to ascertain taxonomic relationships of Bauru Basin isolated teeth material. It's an attempt to make its fossil record more informative; its interpretation better founded, and perhaps standardized.
format Objeto de conferencia
Resumen
author Ghilardi, A. M.
Pimenta, Bernardo
Fernandes, Marcelo A.
author_facet Ghilardi, A. M.
Pimenta, Bernardo
Fernandes, Marcelo A.
author_sort Ghilardi, A. M.
title Morphometrics of teropodomorph isolated teeth material from Bauru Basin (Upper Cretaceous, Southeast Brazil)
title_short Morphometrics of teropodomorph isolated teeth material from Bauru Basin (Upper Cretaceous, Southeast Brazil)
title_full Morphometrics of teropodomorph isolated teeth material from Bauru Basin (Upper Cretaceous, Southeast Brazil)
title_fullStr Morphometrics of teropodomorph isolated teeth material from Bauru Basin (Upper Cretaceous, Southeast Brazil)
title_full_unstemmed Morphometrics of teropodomorph isolated teeth material from Bauru Basin (Upper Cretaceous, Southeast Brazil)
title_sort morphometrics of teropodomorph isolated teeth material from bauru basin (upper cretaceous, southeast brazil)
publishDate 2010
url http://sedici.unlp.edu.ar/handle/10915/16884
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AT fernandesmarceloa morphometricsofteropodomorphisolatedteethmaterialfrombaurubasinuppercretaceoussoutheastbrazil
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