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Re: Measurements of two ilia and some other questions about Sinraptorids



Rutger wrote:
When reading through the links you've supplied, the name didn't turn
up in Chure's thesis or are you talking about the published version? HP Mickey Mortimer wrote about a second message about the thesis, but
I haven't seen it in the DML messages, could it be in there?

No. Mickey has not written it yet...

Okie... I'm bored.  So I'm going to throw in some extra info.

While reading the SVP 2002 Abstracts...

THE PHYLOGENETIC RELATIONSHIPS OF MEGALOSAURIDAE WITHIN BASAL
TETANURINE THEROPODS (DINOSAURIA).

ALLAIN, Ronan, Museum National d?Histoire Naturelle, Laboratoire de
Paléontologie, UMR 8569 CNRS 8 rue Buffon Paris, F-75005 France.

"The discovery of Poekilopleuron? valesdunensis from the Middle Bathonian of Normandy provides us cranial and postcranial characters that are crucial for reconstructing the phylogeny of basal tetanurine theropods commonly related to poorly known Megalosauridae. Phylogenetic analyses of a data matrix of 107 characters and 22 ingroup taxa (including 9 European taxa) in a branch and bound search in PAUP support the monophyly of Megalosauridae within a monophyletic Spinosauroidea (Megalosauridae + Spinosauridae + Torvosaurus) which is the sister taxon to Neotetanurae (Allosauroidea + Coelurosauria).
Ceratosaurus lies closer to Tetanurae than to Coelophysis. Poekilopleuron? valesdunensis, Eustreptospondylus, Streptospondylus and Afrovenator are united within Megalosauridae. Lourinhanosaurus is found to be another Megalosauridae, while Metriacanthosaurus and
Erectopus, commonly referred to that clade, are more closely related to Allosauroidea. Neovenator is a basal allosauroid. The resulting strict consensus tree superimposed on the geochronologic time scale suggests that Ceratosauria, Spinosauroidea, Allosauroidea and Coelurosauria were distinct as early as the Early Jurassic. With nine valid taxa, the Middle to Late Jurassic European large theropod fauna thus appears to be more diversified than what has previously been recognized. It is dominated by spinosauroids while these are greatly outnumbered by allosauroids in the North American Morrison Formation."



PAUL 1988 grouped Eustreptospondylus oxoniensis, Piatnitzkysaurus floresi, Gasosaurus constructus, Marshosaurus bicentesimus, CV 00214 (Metriacanthosaurus? sp.), Yangchuanosaurus shangyouensis, & Metriacanthosaurus parkeri in the Eustreptospondylidae (PAUL 1988). He then divided P. floresi, E. oxoniensis, G. constructus, and M. bicentesimus into the Eustreptospondylinae (PAUL 1988) & M.? sp., Y. shangyouensis, and M. parkeri into the Metriacanthosaurinae (PAUL 1988). Paul wrote of Marshosaurus that "it is tempting to put this theropod in the next subfamily [Metriacanthosaurinae]" and cited that the pubic boot was larger than that of the other eustreptospondylines.


ALLAIN 2002 (the JVP paper, not to be confused with the SVP presentation) finds the sinraptorids to be the sister group to the carcharodontosaurids on the basis of two characters:

23) pneumatic openings associated with the internal carotid artery canal (noted as ambigious in Appendix 3)
43) posteroventrally sloping occiput


How many characters support the view of the allosaurids and carcharodontosaurids being sister groups? I thought quite a bit more but I'm often prone to be wrong.

_________________________________________
NICK GARDNER
Palaeoartist
aim CloudRaptor05

References:

Allain, R. (2002) DISCOVERY OF MEGALOSAUR (DINOSAURIA, THEROPODA) IN THE MIDDLE BATHONIAN OF NORMANDY (FRANCE) AND ITS IMPLICATIONS FOR THE PHYLOGENY OF BASAL TETANURAE, Journal of Vertebrate Paleontology, 22(3):548-563, September 2002

Allain, R. (2002) THE PHYLOGENETIC RELATIONSHIPS OF MEGALOSAURIDAE WITHIN BASAL TETANURINE THEROPODS (DINOSAURIA). Journal of Vertebrate Paleontology, 22(3):31A

Paul, G. (1988) Predatory Dinosaurs of the World, Simon and Schuster: New York, 464 pp.

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