[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Megalosaurid teeth



From: Ben Creisler
bcreisler@gmail.com

A new online paper:

Christophe Hendrickx, Octávio Mateus, and Ricardo Araújo (2014)
The dentition of megalosaurid theropods.
Acta Palaeontologica Polonica (in press)
doi:http://dx.doi.org/10.4202/app.00056.2013
http://app.pan.pl/article/item/app000562013.html

Theropod teeth are particularly abundant in the fossil record and
frequently reported in the literature. Yet, the dentition of many
theropods has not been described comprehensively, omitting details on
the denticle shape, crown ornamentation and enamel texture. This
paucity of information has been particularly striking in basal clades,
thus making identification of isolated teeth difficult, and taxonomic
assignments uncertain. We here provide a detailed description of the
dentition of Megalosauridae, and a comparison to and distinction from
superficially similar teeth of all major theropod clades. Megalosaurid
dinosaurs are characterized by a mesial carina facing mesiolabially in
most mesial teeth, centrally positioned carinae on both most mesial
and lateral crowns, a mesial carina terminating above the cervix, and
short to well-developed interdenticular sulci between distal
denticles. A discriminant analysis performed on a dataset of numerical
data collected on the teeth of 62 theropod taxa reveals that
megalosaurid teeth are hardly distinguishable from other theropod
clades with ziphodont dentition. This study highlights the importance
of detailing anatomical descriptions and providing additional
morphometric data on teeth with the purpose of helping to identify
isolated theropod teeth in the future.