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RE: New Papers of the Ya-Ya Sisterhood
Jerry Harris wrote:
> Case, J.A., Martin, J.E., and Reguero, M. 2007. A dromaeosaur from the
> Maastrichtian of James Ross Island and the Late Cretaceous Antarctic
> dinosaur fauna; pp. 1-4 in Cooper, A., Raymond, C., and Team, I.E. (eds.),
> Antarctica: a Keystone in a Changing World -- Online Proceedings for the
> Tenth International Symposium on Antarctic Earth Sciences. U.S. Geological
> Survey Open-File Report 2007-1047, SRP 083. U.S. Geological Survey,
> Washington, D.C.
This means that dromaeosaurids (or putative dromaeosaurids) have now been
reported from EVERY continent:
North America - Deinonychus, Saurornitholestes, Bambiraptor, Dromaeosaurus,
Atrociraptor, Utahraptor, unnamed/non-diagnostic material.
South America - Buitreraptor, Unenlagia, Neuquenraptor?, Unquillosaurus??,
Africa - Rahonavis, unnamed/non-diagnostic material incl. Wadi Milk material
Europe - Pyroraptor, Variraptor?, Nuthetes?, Dromaeosauroides?,
Asia - Mahakala, Microraptor (=Cryptovolans?), Graciliraptor, Sinornithosaurus,
Shanag, Adasaurus, Velociraptor, Tsaagan, Achillobator, Luanchuanraptor,
Hulsanpes?, unnamed/non-diagnostic material.
Australia - unnamed/non-diagnostic material (teeth, ulna). (e.g.,
Antarctica - above.
> ABSTRACT: The recovery of material of a small theropod from the Early
> Maastrichtian, Cape Lamb Member of the Snow Hill Island Formation is an
> unusual occurrence from primarily marine sediments. The pedal morphology of
> the specimen that includes a Metatarsal II with a lateral expansion caudal
> to Metatarsal III, a third metatarsal that is proximally narrow and distally
> wide, a Metatarsal III with a distal end that is incipiently ginglymoidal
> and a second pedal digit with sickle-like ungual are all diagnostic of a
> theropod that belongs to the family of predatory dinosaurs, the
> Dromaeosauridae. Yet this Antarctic dromaeosaur retains plesiomorphic
> features in its ankle and foot morphology. As new dromaeosaur species are
> being recovered from the mid-Cretaceous of South America and the retention
> of primitive characters in the Antarctic dromaeosaur, a new biogeographic
> hypothesis on dromaeosaur distribution has been generated. Gondwanan
> dromaeosaurs are not North America immigrants into South America and
> Antarctica; rather they are the relicts of a cosmopolitan dromaeosaur
> distribution, which has been separated by the vicariant break up of Pangea
> and created an endemic clade of dromaeosaurs in Gondwana.
> In the same volume, for those interested, a paper on a Late Cretaceous flora
> from the Shetland Islands (paper 081) and a juvenile Antarctic elasmosaurid
> (paper 066). Some papers concerning mostly Permian stuff, too.
> Jerry D. Harris
> Director of Paleontology
> Dixie State College
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