[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: bauplan convergence
From: "Ahmed al-Mahasa Sha'ad"
Are you serious?? You must know about the 'fuzzy' theropods like
Sinornithisaurus, Bepaisoaurus, Sinosauropteryx which show a cobvering of
hair-like structures. Feathers evolved from this- true feathers I mean like
you see in Caudipteryx and birds.
Yes, these theropods have some form of furry proto-feathers. However, these
animals are coming from the late Jurassic and early Cretaceous, and not from
the time before Archaeopteryx. Yes, this tells us that these dinosaurs had
proto-feathers, and further study of these animals points towards a common
ancestor. So, does this common ancestor have some form of primitive
feathers/flaps/skin anamolies that could have led to
feathers/proto-feathers. We know (From Archaeopteryx) that some dinosaurs
had full-fledged feathers by the middle Jurassic. So, are these late
Jurassic/Early Cretaceous theropods abrerations, dinosaur lineages that
never developed flight, or descendants of animals that had once developed
flight and then lost it in favor of (fill in blank).
So, while these finds are quite fascinating, since they occur *after* the
origin of avian flight, they only lend a hint at how avian flight developed.
Until we find a pre-Archeopteryx dinosaur *with* some form of proto
feathers, this all remains speculation, based on extrapolation.
Who cares??? Did you read my last messsage>? It is not compulsary for
ALL lineages to copy each other!@!!Why did creodonts return to the sea and
evolve into whales, but why not dogs? They are both terestriall carnivores?
The question isn't why hasn't it evolved in other animals, rather, why did
it develop in dinosaurs in the first place. I guess it was kind of redundant
for me to ask that, when that was the subject being discussed in the first
Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com