This site presents the idea that birds developed from flying pterosaurs.
This is a credible alternative to the current, mainstream idea that birds developed from land-based dinosaurs.
Sunday, June 20, 2010
* The Dino to Bird Cladogram
Here is the standard dino-to-bird diagram.
Notice the distinct difference between the maniraptors (on the right) and the dinosaurs (on the left). The maniraptors are primitive birds and do not belong with the dinosaurs.
How does this cladogram support that? It shows maniraptora as a sub-group of coelurosauria, which is in turn a subgroup of avetheropoda.So in order for your theory to be true, dinosauria would be paraphyletic. I just don't see how this cladogram supports that, especially because it doesn't even include pterosauria. Also, this cladogram doesn't even show the matrix used. As far as I can tell, your theory is only based on analogous traits (wings), and traits that may the ancestral traits of all ornithodirans (feather-like structures), while the dinosaur to bird hypothesis is supported by a massive amount of data.
This cladogram is quite wrong. But I have to begin somewhere. You have said that "as far as you can tell the theory I am presenting is only based on analogous traits (wings), and traits that may the ancestral traits of all ornithodirans (feather-like structures)". It would seem you have not read the dozens and dozens of posts that outline the case.
How does this cladogram support that? It shows maniraptora as a sub-group of coelurosauria, which is in turn a subgroup of avetheropoda.So in order for your theory to be true, dinosauria would be paraphyletic. I just don't see how this cladogram supports that, especially because it doesn't even include pterosauria. Also, this cladogram doesn't even show the matrix used. As far as I can tell, your theory is only based on analogous traits (wings), and traits that may the ancestral traits of all ornithodirans (feather-like structures), while the dinosaur to bird hypothesis is supported by a massive amount of data.
ReplyDeleteThis cladogram is quite wrong. But I have to begin somewhere.
ReplyDeleteYou have said that "as far as you can tell the theory I am presenting is only based on analogous traits (wings), and traits that may the ancestral traits of all ornithodirans (feather-like structures)". It would seem you have not read the dozens and dozens of posts that outline the case.
Yes I have read them, and nothing I have read seems to be based on hard evidence. Quoting yourself doesn't help your case.
ReplyDeleteFind some specific thing you object to in the posts and we can talk. General comments are not of much value.
ReplyDelete