According to the picture blow, how many times did branched filaments evolve in dinosaurs?

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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According to the picture blow, how many times did branched filaments evolve in dinosaurs? 

rulong
Thyreophora
ttacosa
(ex. Triceratops)
Ornithopoda
Ceratopsidae
Sauropoda
(ex. Allosaurus)
Yutyrannus
Allosauroidea
(ex. Tyrannosaurus)
Oviraptorosauria
Deinonychosauria
(ex. Velociraptor)
Tyrannosauridae
Integument
´Ornithischia
Scales = 0
Maniraptora
Filaments = 1
Theropoda
Saurischia
Branched Filaments = 2
The tree above is a simplified version of the prevailing hypothesis of the relationships
between various dinosaurs and dinosaur groups. The legend on the bottom left
reflects three basic conditions that describe the character that pertains to body
covering (or integument). The conditions that pertain to the specific taxa at the top of
the tree are shown by the numbers.
Dinosauria
Trace the integument character along the tree (you may want draw it out on
a separate sheet of paper). Once you have done that step, consider the
ancestor of all dinsoaurs. What character condition did you get?
Crocodiles
Pterosauria
O (ex. Pteroda
O (ex. Stegosaurus)
Kul
indadromeus
Psaurus
(ex. Iguanodon)
O (ex. Brontosaurus)
Birds
Transcribed Image Text:rulong Thyreophora ttacosa (ex. Triceratops) Ornithopoda Ceratopsidae Sauropoda (ex. Allosaurus) Yutyrannus Allosauroidea (ex. Tyrannosaurus) Oviraptorosauria Deinonychosauria (ex. Velociraptor) Tyrannosauridae Integument ´Ornithischia Scales = 0 Maniraptora Filaments = 1 Theropoda Saurischia Branched Filaments = 2 The tree above is a simplified version of the prevailing hypothesis of the relationships between various dinosaurs and dinosaur groups. The legend on the bottom left reflects three basic conditions that describe the character that pertains to body covering (or integument). The conditions that pertain to the specific taxa at the top of the tree are shown by the numbers. Dinosauria Trace the integument character along the tree (you may want draw it out on a separate sheet of paper). Once you have done that step, consider the ancestor of all dinsoaurs. What character condition did you get? Crocodiles Pterosauria O (ex. Pteroda O (ex. Stegosaurus) Kul indadromeus Psaurus (ex. Iguanodon) O (ex. Brontosaurus) Birds
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