The tree shows one lineage of ornithischian dinosaurs and many lineages of theropoddinosaurs. Some important traits are mapped on the tree including the aspects of feathers, digits of thehands and a few behaviors.a. What phylogenetic function do the Ornithischian dinosaurs play in this tree?b. What trait is shared by all theropod dinosaurs?c. Only two lineages are thought to be capable of flight. What trait may have helped their wings to bestrong enough?d. What seems to happen to the bones of the hand across this tree of dinosaurs?e. What other bone characteristics might be important to ultimately enabling flight? Four digitsin handsHollow bones,furcula (wish bone)EoraptorHollow cylindricalfeathersTufted feathersCoelophysoldsPubic boot, three digitsin handSemilunate carpal in hand,feathers dosed with barbulesand hooks, nest-broodingFeathers dosed and asymmetricalLong arms (ulna longer than femur)Toothless beak, fused wingdigits, short feathered tallOrnithischian dinosaursLoss of V: IIand III aboutthe same lengthAllosaundsCompsognathidsTyrannosauroidsDromeosauridsArchaeopteryxOviraptorosaurs111Living birds240 230 220 210 200 190 180 170 160 150 140 130 120 110 Millions of years agoReductionof IV and VLoss of IVand V; II islongerReductionof 111Elongationof 11Reduction of1: fusion ofII and III:loss of somephalanges

Ornithischian dinosaurs in the above tree serves as a reference point for the theropod dinosaurs…

Answered: The tree shows one lineage of…

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter31: Sponges, Cnidarians, Ctenophores, And Protostomes

Section: Chapter Questions

Problem 7TYU: Which of the following characteristics is associated with mollusks? (a) mandibles (b) mantle (c)...

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The tree shows one lineage of ornithischian dinosaurs and many lineages of theropod
dinosaurs. Some important traits are mapped on the tree including the aspects of feathers, digits of the
hands and a few behaviors.

a. What phylogenetic function do the Ornithischian dinosaurs play in this tree?
b. What trait is shared by all theropod dinosaurs?
c. Only two lineages are thought to be capable of flight. What trait may have helped their wings to be
strong enough?
d. What seems to happen to the bones of the hand across this tree of dinosaurs?
e. What other bone characteristics might be important to ultimately enabling flight?

Four digits
in hands
Hollow bones,
furcula (wish bone)
Eoraptor
Hollow cylindrical
feathers
Tufted feathers
Coelophysolds
Pubic boot, three digits
in hand
Semilunate carpal in hand,
feathers dosed with barbules
and hooks, nest-brooding
Feathers dosed and asymmetrical
Long arms (ulna longer than femur)
Toothless beak, fused wing
digits, short feathered tall
Ornithischian dinosaurs
Loss of V: II
and III about
the same length
Allosaunds
Compsognathids
Tyrannosauroids
Dromeosaurids
Archaeopteryx
Oviraptorosaurs
111
Living birds
240 230 220 210 200 190 180 170 160 150 140 130 120 110 Millions of years ago
Reduction
of IV and V
Loss of IV
and V; II is
longer
Reduction
of 111
Elongation
of 11
Reduction of
1: fusion of
II and III:
loss of some
phalanges

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