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Produced by and for Hot Science - Cool Talks by the Environmental Science Institute. We request that
the use of these materials include an acknowledgement of the presenter and Hot Science - Cool Talks
by the Environmental Science Institute at UT Austin. We hope you find these materials educational
and enjoyable.
Dr. Julia Clarke
March 25, 2011
Dinosaurs in Living Color
# 71
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Dinosaurs In Living Color
March 25, 2011
Julia Clarke
Associate Professor and Wilson Fellow in Vertebrate Paleontology
Jackson School of Geosciences, UT - Austin
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Illustration of early crocodile relative
Effigia © Giant Screen Films
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What is a dinosaur?
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“dino” comes from from the
Greek word deino: fearfully
great or terrible
“saur” comes from from the
Greek word sauros: lizard or
reptile
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Illustration by © Joe Tucciarone
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Illustration by © Robert Walters
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Illustration by © Joe Tucciarone
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Stegosaurus
Illustration by © Joe Tucciarone
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Why are some of these
animals called dinosaurs and
some not?
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Dinosauria is a particular branch of the
tree of life.
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Dinosaurs are parts of a particular branch
of the tree of life.
We are on another.
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Dinosauria
(including
birds)
Illustration from Hillis, Zwickl and Gutell, UT- Austin
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Crocodiles
Illustration from Hillis, Zwickl and Gutell, UT- Austin
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How did we figure out the “address” of dinosaurs?
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neck
filament-like
proto-feathers
Sinosauropteryx
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Dilong : a proto-feather covered
tyrannosaurid
Illustration by © Portia Sloan
Xu et al., 2004
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Photograph of Psittacosaurus; Mayr et al., 2002.
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Zheng et al., 2009
Tianyulong
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Illustration by © Luis Rey
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Photo © Jakob Vinther
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Illustration by © Gregory Paul
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Big picture
Illustration by © Luis Rey
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How would you figure out the color of an extinct dinosaur?
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Image from: Cornell Laboratory of Ornithology
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Vinther et al., 2008
Cretaceous feather from Brazil
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Eumelanosomes
Rock matrix
Eumelanosomes -modern
Vinther et al., 2008
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eumelanosomes
melanosomesabsent
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Melanosomes are pigment packages
the shape of which varies with the occurrence of two
chemically distinct forms of melanin.
Red hairBlack hair
Liu et al., 2005
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Melanin based coloration
Browns and rufous reds:phaeomelanosomes
Black:eumelanosomes
Melanosomes absent
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Anchiornis huxleyi – a troodontid dinosaur
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Comparisons with melanosome samples associated with red-brown, black,
and gray colors in living birds
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Illustration by © Michael DiGiorgio
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Illustration by © Zhao Chuang / Xing Lida
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Illustration by © Michael DiGiorgio
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Illustration by © Michael DiGiorgio
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Giant Penguins
Illustration by © Kristin Lamm
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Illustration by © Katie Brown, UT Austin
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Dr. Julia Clarke
Professor Julia Clarke is a paleontologist at the Department of Geological Sciences, Jackson School of Geosciences at The University of Texas at Austin, as well as research associate with the American Museum of Natural History. Clarke is lead author of an article in the September 2010 issue in the journal Science of her research team discovery of the first fossilized penguin species found with evidence of feathers. Her research interests include vertebrate paleontology and evolution of morphology, as well as avian anatomy and evolution.