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Re: Tetanurae (Dinosauria: Theropoda).phylogeny

Alas, J Syst Palaeo falls through the cracks of my journal access - if
anyone could pass this along I'd be much obliged!


On Thu, May 17, 2012 at 11:02 AM, Mickey Mortimer
<mickey_mortimer111@msn.com> wrote:
> Metriacanthosauridae?  Yes!  Score one for following the rules.
> Mickey Mortimer
> ----------------------------------------
>> Date: Thu, 17 May 2012 08:53:44 -0700
>> From: bcreisler@gmail.com
>> To: dinosaur@usc.edu
>> Subject: Tetanurae (Dinosauria: Theropoda).phylogeny
>> From: Ben Creisler
>> bcreisler@gmail.com
>> A paper in the new issue of Journal of Systematic Palaeontology:
>> Matthew T. Carrano, Roger B. J. Benson & Scott D. Sampson (2012)
>> The phylogeny of Tetanurae (Dinosauria: Theropoda).
>> Journal of Systematic Palaeontology 10(2): 211-300
>> DOI:10.1080/14772019.2011.630927
>> http://www.tandfonline.com/doi/abs/10.1080/14772019.2011.630927
>> Abstract
>> Tetanuran theropods represent the majority of Mesozoic predatory
>> dinosaur diversity and the lineage leading to extant Aves. Thus their
>> history is relevant to understanding the evolution of dinosaur
>> diversity, Mesozoic terrestrial ecosystems, and modern birds.
>> Previously, the fragmentary and poorly sampled fossil record of basal
>> (non-coelurosaur) tetanurans led to uncertainties regarding their
>> basic interrelationships. This in turn prevented determining the
>> relationships of many incompletely known taxa that nonetheless
>> document a global radiation spanning more than 120 million years. We
>> undertook an exhaustive examination of all basal tetanurans and all
>> existing character data, taking advantage of recent discoveries and
>> adding new morphological, temporal and geographic data. Our cladistic
>> analysis of 61 taxa achieved significantly improved phylogenetic
>> resolution. These results position several ‘stem’ taxa basal to a
>> succession of monophyletic clades (Megalosauroidea, Allosauroidea and
>> Coelurosauria). Megalosauroids include nearly 20 taxa arrayed amongst
>> a basalmost clade (Piatnitzkysauridae, fam. nov.) and the sister taxa
>> Spinosauridae and Megalosauridae; the latter includes two subfamilies,
>> Megalosaurinae and Afrovenatorinae subfam. nov. Allosauroidea contains
>> a diverse Metriacanthosauridae (= Sinraptoridae), Neovenatoridae,
>> Carcharodontosauridae and a reduced Allosauridae. Finally, we assessed
>> more than 40 fragmentary forms and hundreds of additional reported
>> tetanuran occurrences. Tetanuran evolution was characterized by
>> repeated acquisitions of giant body size and at least two general
>> skull forms, but few variations in locomotor morphology. Despite
>> parallel diversification of multiple lineages, there is evidence for a
>> succession of ‘dominant’ clades. Tetanurae first appeared by the Early
>> Jurassic and was globally distributed by the Middle Jurassic. Several
>> major clades appeared prior to the breakup of Pangaea; as such their
>> absence in specific regions, and at later times, must be due to poor
>> sampling, dispersal failure and/or regional extinction. Finally, we
>> outline a general perspective on Mesozoic terrestrial biogeography
>> that should apply to most clades that appeared before the Late
>> Jurassic.

Scott Hartman
Scientific Advisor/Technical Illustrator
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