Wednesday, July 6, 2011

Senter Strikes Again

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Senter shows that Maniraptors are not related to dinosaurs: http://onlinelibrary.wiley.com/doi/10.1111/j.1420-9101.2011.02349.x/abstract ...
47 comments:
Tuesday, February 15, 2011

Symplesiomorphy

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Turning back to the development of pterosaurs to modern birds: It is believed that dinosaurs and pterosaurs were Ornithodirans . The dino...
75 comments:
Friday, February 11, 2011

The ancestor of ducks, geese and swans

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http://en.wikipedia.org/wiki/Presbyornithidae Presbyornithidae were a family of waterbirds with an apparently global distribution that ...
20 comments:
Tuesday, February 8, 2011

Analyzing the three major branches

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Working with the idea that very early on, three major branches of birds formed ( water birds, shorebirds, and land birds ), we can look at t...

Confirmation

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http://www.owlpages.info/downloads/A_Phylogenomic_Study_of_Birds_Reveals_Their_Evolutionary_History.pdf Quote: Modern birds occupy a ...
5 comments:
Thursday, January 20, 2011

Seabirds

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http://en.wikipedia.org/wiki/Seabird "There exists no single definition of which groups, families, and species are seabirds, and most...

More detail on the major branches

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http://www.owlpages.info/downloads/A_Phylogenomic_Study_of_Birds_Reveals_Their_Evolutionary_History.pdf "The largest clade in Neoaves ...
Tuesday, January 18, 2011

Strong Support

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Here is strong support for what I am proposing: http://www.owlpages.info/downloads/A_Phylogenomic_Study_of_Birds_Reveals_Their_Evolutionary...
2 comments:
Saturday, January 15, 2011

Petrels

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The pattern of development is interesting. http://en.wikipedia.org/wiki/Procellariidae "According to the famous DNA hybridization st...
Tuesday, January 11, 2011

Owls

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This chart shows that owls have their own separate lineage (within the landbird branch) which supports what I have proposed concerning owls:...
4 comments:
Monday, January 10, 2011

The Branching Tree

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Many existing bird orders trace back to Enantiornithes niche subgroups. Quote: http://en.wikipedia.org/wiki/Enantiornithes so tha...
4 comments:
Wednesday, January 5, 2011

Aves 3D

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This is a very cool website showing bird structures in 3D: Here is an ostrich sternum (not keeled): http://aves3d.org/specimens/129-Struth...
Friday, December 17, 2010

The Basic Picture

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The basic picture is that during the Cretaceous, separate primitive bird lines were established, each within its particular niche. And then...
2 comments:
Sunday, December 12, 2010

Bird Groupings

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Here is one study of how modern birds can be classified. Hackett et al. cladogram http://www.owlpages.info/downloads/A_Phylogenomic_Study...
Saturday, December 4, 2010

Filling in the picture (2)

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Consider all the taxa (gold bars) that extend to near the K/T extinction (65 mya). Those are Oviraptorids, Troodontids, Dromaeosaurids...

Filling in the picture (1)

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To repeat an important point, consider the time-based cladogram (above) that we saw earlier Note that the group labeled "Modern birds...
Friday, December 3, 2010

Additional fossils

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Here are some additional fossils. http://www.oceansofkansas.com/Pteranodon.html Notice the pteroid bone. In both pictures the pteroid bone i...
Thursday, December 2, 2010

The primitive bird 1st metacarpal.

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Here is the primitive bird Deinonychus hand: http://www.pnas.org/content/96/9/5111/F3.large.jpg http://www.pnas.org/content/96/9/5111.full...

Revised total progression

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Total progression 2 -3-4-4-x Pterosaur x-2-3-4-x Primitive bird (maniraptors that are not modern birds) Note: http://www.seaworld.or...
10 comments:

Pterosaur wrist (5)

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More on the pterosaur wrist. http://jeb.biologists.org/cgi/content-nw/full/210/10/1663/ Fig. 4. (A) Lateral view of the right medial...