Pterosaurs to Birds: Frances James Study

Friday, July 23, 2010

Frances James Study

For those who wish to learn more about the dinosaur to bird hypothesis, and other archosaur (but not pterosaur) candidates, I heartily recommend:

Cladistics and the Origin of Birds: A Review and Two New Analyses
Frances C. James and John A. Pourtless IV
http://www.bio.fsu.edu/James/Ornithological%20Monographs%202009.pdf

The only caveat I have is that the study does not consider pterosaurs and does not include time based cladograms.

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Here is a summary of the basic ideas of this site:

Birds developed in a lineage from short bony tailed pterosaurs to short bony tailed scansoriopterygids that developed into basal pygostylia that developed into modern birds. A side lineage earlier developed from the long tailed pterosaurs to long bony tailed scansoriopterygids. That lineage went extinct. The category called coelurosaur dinosaurs includes only actual dinosaurs (eg. tyrannosaurs). It does not include birds. The fossil record supports the pterosaur-to-bird theory. The fossil record does not support the dinosaur-to-bird theory.

Pterosaurs to Birds

Friday, July 23, 2010

Frances James Study

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