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RE: Juvenile Megaraptor (theropod) from Cretaceous of Argentina
Anybody have a copy of this aforementioned paper
below on Megaraptor ??
If you do .. would you be so kind as to send a spare
copy to me ?? Many thanks in advance.
> Date: Sat, 21 Jun 2014 08:36:23 -0700
> From: firstname.lastname@example.org
> To: email@example.com
> Subject: Juvenile Megaraptor (theropod) from Cretaceous of Argentina
> Ben Creisler
> A new paper:
> Juan D. Porfiri, Fernando E. Novas, Jorge O. Calvo, Federico L.
> Agnolín, Martín D. Ezcurra & Ignacio A. Cerda (2014)
> Juvenile specimen of Megaraptor (Dinosauria, Theropoda) sheds light
> about tyrannosauroid radiation.
> Cretaceous Research 51: 35–55
> DOI: 10.1016/j.cretres.2014.04.007
> We describe a juvenile specimen of the enigmatic Patagonian theropod
> We offer a detailed description of the first known skull bones of this taxon.
> Skull morphology agrees with coelurosaurian affinities, bolstering the
> hypothesis that megaraptorans are members of this theropod clade.
> We also recognize several cranial features that are similar to
> tyrannosauroid coelurosaurians.
> Megaraptorids are a group of predatory dinosaurs that inhabited
> Gondwana from Cenomanian to Santonian times (Late Cretaceous).
> Phylogenetic relationships of megaraptorids have been matter of recent
> debate, being alternatively interpreted as basal coelurosaurs,
> carcharodontosaurian allosauroids, megalosauroids, and basal
> tyrannosauroids. One of the main reasons for such different
> interpretations is the incomplete nature of most available
> megaraptorid skeletons and, in particular, the scarce information
> about their cranial anatomy. Here we describe a partially preserved
> skeleton of a juvenile specimen of Megaraptor namunhuaiquii that
> provides substantial new information about the cranial morphology of
> this Patagonian taxon. The specimen comes from the Upper Cretaceous
> (Turonian–Coniacian) of the Portezuelo Formation, northwestern
> Patagonia, Argentina. The anatomy of the new specimen bolsters the
> recently proposed hypothesis that megaraptorids are nested within
> Coelurosauria, and possibly within Tyrannosauroidea. The most relevant
> features that megaraptorans share with tyrannosauroids include several
> foramina on the premaxillary body, extremely long and straight
> prenarial process of the premaxilla, incisiviform premaxillary teeth
> with a D-shaped cross-section, and cranially expanded supratemporal
> fossae separated from each other by a sharp sagittal median crest on
> frontals, which was presumably extended caudally above the parietals
> (not preserved). Information gathered from the present specimen allows
> to make for the first time a reconstruction of the skull of Megaraptor
> and hypothesize about evolutionary trends within Tyrannosauroidea.