Friday, July 29, 2022

Cladogram

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 The cladogram shows that birds did not evolve from dinosaurs. Click to enlarge. See Comments for taxa and characters.
6 comments:
Wednesday, June 8, 2022

Scoring dinosaur and pterosaurs

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 Various studies analyze dinosaurs (including birds that they think evolved from dinosaurs).   And other studies analyze pterosaurs . But n...
Monday, May 30, 2022

Pterosaur parental care

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https://blog.everythingdinosaur.co.uk/blog/_archives/2017/12/02/hamipterus-nesting-ground-discovery.html Pterosaurs like birds , were capabl...
Sunday, May 29, 2022

A summary of the basic ideas of this site

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 H ere is a summary of the basic ideas of this site: Birds developed in a lineage  from s hort bony tailed   pterosaurs  to  short bony tail...

Barbules in Paraves

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https://biblio.ugent.be/publication/8752596/file/8752597.pdf Some feather morphologies are shared (that is, monofilaments, brush-like and tu...

Similar skull openings

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Similar skull openings of pterodactylid and scansoriopterygid: https://en.wikipedia.org/wiki/Tupandactylus#/media/File:Cast_of_Tupandactylus...
Saturday, May 28, 2022

High level similarities

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High level similarities: Pterosaur pterodactylid (eg tupandactylus): Membrane wing  Longest 4th finger Stage IIIa feathers Short bony tail  ...
Thursday, May 19, 2022

Pterosaur stage IIIa feathers

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https://biblio.ugent.be/publication/8752596/file/8752597.pdf To our knowledge, stage IIIa feathers have not previously been reported in pte...
5 comments:
Wednesday, May 18, 2022

Most parsimonious scenario

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   https://biblio.ugent.be/publication/8752596/file/8752597.pdf  (2022)   The genotypic and phenotypic characters could both be ancestral to...
Tuesday, May 17, 2022

Pterosaur feathers

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 https://biblio.ugent.be/publication/8752596/file/8752597.pdf (2022) Remarkably well-preserved soft tissues in Mesozoic fossils have yielde...
4 comments:

Scansoriopteryx

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  http://link.springer.com/article/10.1007/s10336-014-1098-9/fulltext.html  (2014) Jurassic archosaur is a non-dinosaurian bird Stephen A. C...

Summary

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I am suggesting the following: Long bony tailed rhamphorhynchid --> Long bony tailed scansoriopterygid (eg scansoriopteryx) --> Derive...
Monday, May 16, 2022

Adding to the picture

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To this point I have focussed on the development from long bony tailed pterosaurs (rhamphorhynchids) to long bony tailed scansoriopterygid...
2 comments:

Digging deeper

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Some long bony tailed pterosaurs (eg rhamphorhynchids) developed into long bony tailed scansoriopterygids. And some of those long bony taile...
1 comment:
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 ...