Philip J. Currie y Ariana Paulina Carabajal
There were considerable
differences in Late Cretaceous faunas of the Northern and Southern Hemispheres,
although the differences were breaking down during Campanian and Maastrichtian
times with the appearance of hadrosaurids in Antarctica and South America, and titanosaurids
in North America. However, theropods continued to be separated into northern
and southern faunas until paravians were discovered in the Southern Hemisphere
(Novas and Puerta, 1997; Forster et al. 1998; Calvo et al. 2004; Makovicky et
al. 2005; Novas and Pol, 2005; Novas et al. 2008). During the 2008 field
season, a joint expedition to the Bajo de Santa Rosa (Río Negro, Argentina)
recovered a second, slightly smaller specimen of Austroraptor cabazai Novas,
Pol, Canale, Porfiri and Calvo, 2008 (Novas et al. 2008; Paulina Carabajal et
al., 2009). The specimen was identified on the basis of the morphology of the
humerus, metatarsal III and pedal phalanx IV-2 (originally identified as IV-1
in the holotype, MML 195). Although the skeleton is incomplete, it preserves
bones (radius, ulna, and elements of the metacarpus, metatarsus and pes) that
were not recovered with the holotype of this large dromaeosaurid. The
description of this second specimen is intended to complement the description
of the holotype (Novas et al., 2008), adding information about the limb
morphology, particularly the forelimb and foot of this dinosaur.
Currie, P.J. y Paulina Carabajal, A. 2012.
A new specimen of
Austroraptor cabazai Novas, Pol, Canale, Porfiri and Calvo, 2008 (Dinosauria,
Theropoda, Unenlagiidae) from the Latest Cretaceous (Maastrichtian) of Río
Negro, Ameghiniana 49(4): 662-667.
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