Thursday, July 11, 2019

A problem with the word "dinosaur"

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Take note of the following problem: http://www.ucmp.berkeley.edu/diapsids/dinomm.html One important dinosaurian synapomorphy is the perf...
5 comments:
Monday, July 8, 2019

Cup-like Acetabulum

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Basal paraves had a  partially  closed ( cup-like ) acetabulum that allowed them to abduct (splay, sprawl) their legs. Pterosaurs had a co...
7 comments:
Wednesday, May 8, 2019

Ambopteryx

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https://www.nature.com/articles/s41586-019-1137-z  (2019) Yi qi , which has membranous wings—a flight apparatus that was previously unknow...
4 comments:
Sunday, February 17, 2019

Convergence

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It is sometimes said that coelurosaur dinosaurs and the ancestors of pterosaurs convergently evolved  characteristics related to flying. I...
2 comments:
Wednesday, December 19, 2018

Pterosaurs had feathers

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https://www.nature.com/articles/s41559-018-0728-7.epdf?author_access_token=g0SJk_S0UlYkd9ChFUOfsdRgN0jAjWel9jnR3ZoTv0OhuDOmy4G-1OHvOkIfGGVa...
3 comments:
Monday, October 2, 2017

Beginning at the same time

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Paravians and the type of dinosaur they are  purported  to have evolved from  basal Tyrannoraptora , appear in the fossil record  beginning ...
Friday, August 25, 2017

Feathers

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https://books.google.co.uk/books?id=KG86AgWwFEUC&pg=PA454&dq=patagial&hl=en&sa=X&ei=AzRBVendC9DLaOehgMgC&ved=0CCoQ6...
1 comment:
Sunday, July 23, 2017

The digits transition

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I am working with the following hypothesis of the transition of fingers and phalanges:        I  II  III  IV V P-2-3-4-5-x Pterosaur x-x-...
2 comments:
Wednesday, June 7, 2017

Tyrannosauroid integument reveals conflicting patterns of gigantism and feather evolution

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http://rsbl.royalsocietypublishing.org/content/13/6/20170092 Tyrannosauroid integument reveals conflicting patterns of gigantism and feat...
1 comment:
Friday, May 26, 2017

The Dinosaur to Bird Hypothesis Lacks Statistical Support

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Cladograms which are  based on bootstrap/jackknife,  show that there is a large polytomy at the base of the coelurosaur clade. This is becau...
3 comments:
Wednesday, April 26, 2017

Secondarily flightless paravians

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https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4476167/#supplemental-informationtitle  (2015) Cau et al Furthermore, phylogenetic analyses ...
1 comment:
Thursday, April 20, 2017

"An abnormally rapid period of morphological evolution"

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We have seen that the statistical support values do not support the dinosaur to bird hypothesis. See earlier posts . Consequently we are ju...
3 comments: