有哪些信誉好的足球投注网站a new troodontid theropod dinosaur from the lower cretaceous of utah一个新的troodontid从犹他下白垩统的兽脚亚目食肉恐龙.pdfVIP
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a new troodontid theropod dinosaur from the lower cretaceous of utah一个新的troodontid从犹他下白垩统的兽脚亚目食肉恐龙
A New Troodontid Theropod Dinosaur from the Lower
Cretaceous of Utah
1 2 3 4
Phil Senter *, James I. Kirkland , John Bird , Jeff A. Bartlett
1 Department of Biological Sciences, Fayetteville State University, Fayetteville, North Carolina, United States of America, 2 Utah Geological Survey, Salt Lake City, Utah,
United States of America, 3 College of Eastern Utah Prehistoric Museum, Price, Utah, United States of America, 4 College of Eastern Utah, Price, Utah, United States of
America
Abstract
Background: The theropod dinosaur family Troodontidae is known from the Upper Jurassic, Lower Cretaceous, and Upper
Cretaceous of Asia and from the Upper Jurassic and Upper Cretaceous of North America. Before now no undisputed
troodontids from North America have been reported from the Early Cretaceous.
Methodology/Principal Findings: Herein we describe a theropod maxilla from the Lower Cretaceous Cedar Mountain
Formation of Utah and perform a phylogenetic analysis to determine its phylogenetic position. The specimen is distinctive
enough to assign to a new genus and species, Geminiraptor suarezarum. Phylogenetic analysis places G. suarezarum within
Troodontidae in an unresolved polytomy with Mei, Byronosaurus, Sinornithoides, Sinusonasus, and Troodon + (Saurornithoides +
Zanabazar). Geminiraptor suarezarum uniquely exhibits extreme pneumatic inflation of the maxilla internal to the antorbital
fossa such that the anterior maxilla has a triangular cross-section. Unlike troodontids more closely related to Troodon, G.
suarezarum exhibits bony septa between the dental alveoli and a promaxillary foramen that is visible in lateral view.
Conclusions/Significance: This is the first report of a North American troodontid from the Lower Cretaceous. It therefore
contribute
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