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Re: Fibula and Bone of Theropod
siriraks arrathrakorn wrote:
>I am not paleontologist but I am interesting in the dinosaur-origin of
>bird. I have some questions.
>1. Is theropod have bigger fibula than bird and archaeopteryx?
>2. Are there any dinosaur that is not theropod and have hollow bone?
>3. What is pterosaur?
In Non Avian Theropods such as Carnosaurs and Ornithomimids etc, the
Fibula is a complete structure, although reduced somewhat in size in
smaller forms. In Birds, the fibula has further reduced in size and I
belive in most modern forms, is no longer connected at the posterior
end, simply tapering to a point.
I've not aware of any Non Theropod with hollow bone structures, other
than crests/head ornamentation in the Lambeosaurs, perhaps other members
could further this line.
Pterosaurs are a part of the Archosauria, the "Ruling Reptiles", Along
with Dinosaurs, and Crocodillians (some may also include Thecodonts
here, as a fourth member of the group) Pterosaurs are considered to be
the closest relatives of Dinosaurs, the Hinged ankle joint being shared
creating a group called Ornithodires I believe. Pterosaurs as a group
have a hyperextended fourth finger, which forms the majority of the wing
Hope this helps,