The dentition of Manidens condorensis (Ornithischia; Heterodontosauridae) from the Jurassic Cañadón Asfalto Formation of Patagonia
Publicado por Leonardo Filippi en 14:26
Marcos G. Becerraa, Diego Pol, Claudia
A. Marsicano and Oliver W.M. Rauhut
The
recently described Manidens condorensis is one of the most completely known
taxa of the family Heterodontosauridae from the southern landmasses. However,
some dental aspects are not well known due to preservational problems in the
type material. This contribution reports new isolated teeth found in the
Canñadón Asfalto Formation (Early-Middle Jurassic). These teeth are referred
to Manidens condorensis based on the presence of autapomorphic characters of
the unusual dentition of this taxon, such as the highly asymmetric tooth crowns
and small crenulations on each denticles. The isolated crowns are well
preserved and reveal the presence of undescribed and new autapomorphical
features, including apical and basal wear facets on the occlusal surface of
isolated crowns and a wear surface also in the caniniform tooth. We carried out
statistical analyses (including morphogeometrical and discriminant analyses),
using the holotype crowns as a morphological starting point, for characterising
shape variation of the crowns along the toothrow and for identifying the
position of isolated crowns. These analyses allow defining morphological
regions within the postcaniniform toothrow and produce a metrically based
discriminant function to predict the hypothetical position of future
discoveries, providing a methodological framework that could be applied to
other extinct heterodont dinosaurs.
Marcos G. Becerra , Diego Pol ,
Claudia A. Marsicano & Oliver W.M. Rauhut (2013). The dentition of Manidens condorensis (Ornithischia;
Heterodontosauridae) from the Jurassic Cañadón Asfalto Formation of Patagonia: morphology,
heterodonty and the use of statistical methods for identifying isolated teeth,
Historical Biology: An International Journal of Paleobiology,
DOI:10.1080/08912963.2013.794227
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