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34 results on '"Bakker, Robert T."'

6. Supplementary methods, specimen descriptions and palaeoclimate data from Tyrannosauroid integument reveals conflicting patterns of gigantism and feather evolution

Author

Bell, Phil R., Campione, Nicolás E., W. Scott Persons, Currie, Philip J., Larson, Peter L., Tanke, Darren H., and Bakker, Robert T.

Abstract

This file contains extended statistical methodology and results, integumentary descriptions (Albertosaurus, Gorogosaurus, Daspletosaurus, Tarbosaurus) and palaeoclimate data for key tyrannosauroid localities.

Published
2017
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7. Thunder lizard handstands: Manus-only sauropod trackways from the Glen Rose Formation (Lower Cretaceous, Kendall County, Texas).

Author

Farlow, James O., Bakker, Robert T., Dattilo, Benjamin F., Everett Deschner, E., Falkingham, Peter L., Harter, Crystal, Solis, Richard, Temple, David, and Ward, William

Subjects
*ROSES, *LIZARDS, *MUSEUM studies, *COUNTIES
Abstract

Three parallel, manus-only sauropod trackways from the Coffee Hollow A-Male tracksite (Glen Rose Formation, Kendall County, Texas) were studied separately by researchers from the Heritage Museum of the Texas Hill Country and the Houston Museum of Natural Sciences. Footprint and trackway measurements generally show good agreement between the two groups' data sets. Footprints appear to be shallowly impressed true tracks rather than undertracks. One of the Coffee Hollow trackways shows marked asymmetry in the lengths of paces that begin with the left as opposed to the right forefoot, and two of the Coffee Hollow trackways are unusually broad. The Coffee Hollow trackways differ enough from the manus portions of other Glen Rose Formation sauropod trackways to suggest that they were made by a different kind of sauropod. Greater differential pressure exerted on the substrate by the forefeet than the hindfeet probably explains the Coffee Hollow trackways, like other manus-only sauropod trackways, but the possibility that they indicate unusual locomotion cannot at present be ruled out. [ABSTRACT FROM AUTHOR]

Published
2020
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9. Tyrannosauroid integument reveals conflicting patterns of gigantism and feather evolution

Author

Belli, Phil R., Campione, Nicolas E., Persons, W. Scott, Currie, Philip J., Larson, Peter L., Tanke, Darren H., Bakker, Robert T., Belli, Phil R., Campione, Nicolas E., Persons, W. Scott, Currie, Philip J., Larson, Peter L., Tanke, Darren H., and Bakker, Robert T.

Abstract

Recent evidence for feathers in theropods has led to speculations that the largest tyrannosaurids, including Tyrannosaurus rex, were extensively feathered. We describe fossil integument from Tyrannosaurus and other tyrannosaurids (Albertosaurus, Daspletosaurus, Gorgosaurus and Tarbosaurus), confirming that these large-bodied forms possessed scaly, reptilian-like skin. Body size evolution in tyrannosauroids reveals two independent occurrences of gigantism; specifically, the large sizes in Yutyrannus and tyrannosaurids were independently derived. These new findings demonstrate that extensive feather coverings observed in some early tyrannosauroids were lost by the Albian, basal to Tyrannosauridae. This loss is unrelated to palaeoclimate but possibly tied to the evolution of gigantism, although other mechanisms exist.

Published
2017
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14. Inside the Head of a Tiny T.Rex

Author

Bakker, Robert T.

Subjects
Tyrannosaurus rex, Evolution, Dinosaurs, Birds, CT imaging, Paleontology, Science and technology
Abstract

http://discovermagazine.com/1992/mar/insidetheheadofa8

Published
1992

20. The ptink pterodactyl

Author

Bakker, Robert T.

Subjects
Pterosauria -- Research, Pterodactyls -- Research
Published
1986

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