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

Theropod teeth from Late Cretaceous of Brazil

From: Ben Creisler

A new paper not yet mentioned yet. The pdf is free (click to open).

Carlos Roberto Candeiro, Philip Currie & Lílian Bergqvist (2012)
Theropod teeth from the Marília Formation (late Maastrichtian) at the
Paleontological Site of Peirópolis in Minas Gerais State, Brazil.
Revista Brasileira de Geociências 42(2):223-330

Theropod teeth share several morphological features at the family
level. The main diagnostic features are tooth shape in cross-section
and the presence of wrinkles on the tooth crowns. Theropods comprise
the most common vertebrate remains in the fossil assemblage from the
Serra da Galga Member, Marília Formation (late Maastrichtian) in the
Bauru Basin Peirópolis Paleontological Site, (Uberaba Town, Minas
Gerais State) of southeastern Brazil. In the studying these specimens,
cross-sectional outlines of the teeth and wrinkles on the surfaces of
the crowns were used to group the teeth into eleven morphological
classes. The tooth cross-sections were drawn using a copper wire to
contour the outline of the most proximal portions of the tooth crowns.
Other features were analyzed using a microscope. Within the ten
morphological classes, morphotypes one and two can be assigned to the
Abelisauridae, and morphotypes three to seven belong to the
Carcharodontosauridae. This is the most abundant record of
Abelisauridae in Minas Gerais State, Brazil. Morphotypes nine and ten
were not identified because they do not have any diagnostic features
of known Gondwanan or Laurasian taxa. The presence of
Carcharodontosauridae teeth in the Member of Serra da Galga (late
Maastrichtian) is the recent record for this family.