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

Sexual dimorphism in tails of two oviraptorosaur dinosaurs? (free pdf)

Ben Creisler

A new paper in open access:

W. Scott Persons IV,  Gregory F. Funston, Philip J. Currie &  Mark A.
Norell (2015)
A possible instance of sexual dimorphism in the tails of two
oviraptorosaur dinosaurs.
Scientific Reports 5, Article number: 9472

The hypothesis that oviraptorosaurs used tail-feather displays in
courtship behavior previously predicted that oviraptorosaurs would be
found to display sexually dimorphic caudal osteology. MPC-D 100/1002
and MPC-D 100/1127 are two specimens of the oviraptorosaur Khaan
mckennai. Although similar in absolute size and in virtually all other
anatomical details, the anterior haemal spines of MPC-D 100/1002
exceed those of MPC-D 100/1127 in ventral depth and develop a hitherto
unreported “spearhead” shape. This dissimilarity cannot be readily
explained as pathologic and is too extreme to be reasonably attributed
to the amount of individual variation expected among con-specifics.
Instead, this discrepancy in haemal spine morphology may be
attributable to sexual dimorphism. The haemal spine form of MPC-D
100/1002 offers greater surface area for caudal muscle insertions. On
this basis, MPC-D 100/1002 is regarded as most probably male, and
MPC-D 100/1127 is regarded as most probably female.