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No Synapsids
Topic Started: Oct 7 2009, 05:37 PM (584 Views)
The Dodo
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What if synapsids never evolved? But Diapsids and Anapsids still did. The Permian fauna would change, something will have to take the mammals place during the Mesozoic and mammals certainly wouldn't be ruling today. There would probably be greater diversification in the other two groups, discuss.
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Carlos
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First of all, try not to use the term "anapsid", because they don't really form a true clade (unless you call diapsids anapsids too), which might get confusing.

And yes, there's literally thousands of possibilities for such a world
Lemuria:
http://s1.zetaboards.com/Conceptual_Evolution/topic/5724950/

Terra Alternativa:
http://s1.zetaboards.com/Conceptual_Evolution/forum/460637/

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Paul_de_Vries
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http://tolweb.org/Amniota/14990

Could The Dodo maybe be be referring to the monophyletic clade anapsida?
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Carlos
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True, though even those may actually just form an unrelated assemblance of groups leading to Diapsida, instead of forming a clade, according to some phylogentic studies
Lemuria:
http://s1.zetaboards.com/Conceptual_Evolution/topic/5724950/

Terra Alternativa:
http://s1.zetaboards.com/Conceptual_Evolution/forum/460637/

My Patreon:

https://www.patreon.com/Carliro

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Paul_de_Vries
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Interesting thought. So anapsida consists not only of turtles and its extinct cousins, but also of the stem diapsids (actually I mean the things that came right before the diapsids, not sure if I'm expressing that correctly) and their cousins. Hmm what do we call them then? I will just refer to amniotes excluding synapsids as sauropsidans for now.

Back to the topic though; the synapsids ruled with an iron fists in the permian and the beginning of the triasic. And while we commonly associate the rise and diversification of the mammals with the demise of the dinosaurs (except for birds), various other synapsid groups diversified plenty before the dinosaurs even existed. So them not existing leaves space for substantial sauropsidan diversification.
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Carlos
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Quote:
 
Interesting thought. So anapsida consists not only of turtles and its extinct cousins, but also of the stem diapsids (actually I mean the things that came right before the diapsids, not sure if I'm expressing that correctly) and their cousins. Hmm what do we call them then? I will just refer to amniotes excluding synapsids as sauropsidans for now.


Indeed; Anapsida may not be a natural group, unless Diapsida is within it.
Lemuria:
http://s1.zetaboards.com/Conceptual_Evolution/topic/5724950/

Terra Alternativa:
http://s1.zetaboards.com/Conceptual_Evolution/forum/460637/

My Patreon:

https://www.patreon.com/Carliro

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Jurassic-Gothic
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Have you even accounted the possibility of Non-Crurotarsian Archosaur differentiation?

I mean Eosuchia, Choristodera and other...
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Carlos
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I know. For all we know perhaps Crurotarsia itself wouldn't evolve, as said groups could become diverse first
Lemuria:
http://s1.zetaboards.com/Conceptual_Evolution/topic/5724950/

Terra Alternativa:
http://s1.zetaboards.com/Conceptual_Evolution/forum/460637/

My Patreon:

https://www.patreon.com/Carliro

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Jurassic-Gothic
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Protorosauria, Simiosauria, Trilophosauria and other bizarre diapsids undergo radiative evolution

But maybe this topic could be merged with this one, couldn't it?

http://s1.zetaboards.com/Conceptual_Evolution/topic/2422396/
Edited by Jurassic-Gothic, Nov 11 2009, 06:11 PM.
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ATEK Azul
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Well merging the topics would be good it also seems that they are going in separate directions and I got stuck(which means merging might as well happen since repterra is based on this).

If they do fuse please take my ideas into consideration along with the posts in Repterra.
I am dyslexic, please ignore the typo's!
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Jurassic-Gothic
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ATEK Azul
Nov 11 2009, 06:14 PM
Well merging the topics would be good it also seems that they are going in separate directions and I got stuck(which means merging might as well happen since repterra is based on this).

If they do fuse please take my ideas into consideration along with the posts in Repterra.
I see. Yes, they should underline your contribution ;)

Or even shift this into "Repterra" :whatever:
Edited by Jurassic-Gothic, Nov 11 2009, 06:28 PM.
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