Re: new fossil find closes 70m year gap in bird evolution

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Sujet : Re: new fossil find closes 70m year gap in bird evolution
De : rokimoto557 (at) *nospam* gmail.com (RonO)
Groupes : talk.origins
Date : 16. Nov 2024, 15:33:19
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On 11/16/2024 5:47 AM, Burkhard wrote:
so the BBC in this article here:
https://www.bbc.co.uk/news/articles/cvg5knlwny4o
 
I put up the thread on the brain of this fossil.
https://www.sciencedirect.com/science/article/pii/S0960982215009458#fig6
My take is that this was a dead end lineage.  It may represent an intermediate stage in avian brain evolution, but the lineage represented by extant birds indicates that the modern brain of the birds evolved, possibly 20 million years before this fossil animal lived.  The link above is to a 2015 review on avian evolution, and the claim is that multiple lineages survived the extinction event that ended the dinos around 65 million years ago.  According to the estimates of this review paper the modern brain structure probably existed 100 million years ago or would have had to evolve by convergent evolution in multiple lineages.  The Palaeognathae and Neognathae divergence is placed over 100 million years ago, and these birds would have been fully flight capable with a keel and the modern bird brain structure.
Molecular based divergence estimates usually do seem to over estimate how deep in the past the divergence occurred.
Ron Okimoto

Date Sujet#  Auteur
16 Nov 24 * new fossil find closes 70m year gap in bird evolution3Burkhard
16 Nov 24 +- Re: new fossil find closes 70m year gap in bird evolution1RonO
16 Nov 24 `- Re: new fossil find closes 70m year gap in bird evolution1William Hyde

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