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| Repterra Earth.; No Synapsids and alot of Archosaurs. | |
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| Topic Started: Oct 19 2009, 04:47 PM (1,107 Views) | |
| ATEK Azul | Oct 19 2009, 04:47 PM Post #1 |
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Transhuman
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Inspired by the no Synapsid topic. In this world Archosaurs would rule the Permian replacing the Synapsids allowing for large amounts of diversity Maybe some groups might evolve earlier in a sense with Dinosaur ancestors diversifying and becomming Dinosaurs earlier thanks to more dominant niches being open for the Dinosaur ancestors. Same with other groups like Pterosaurs and crocodilians maybe? I have no idea of when non-Archosaur reptiles such as lizards(Scientific name?) evolved but their ancestors might be able to exploit niches from smaller Synapsids like Cynodonts and the Dinosaur ancestors theorised niche after they diversify with out Synapsids taking major niches. This increase in diversity might even create some more advanced descendents with so much more diversity or atleast some strange features. The Mesozoic era will be interesting imagine if Theropods(their equivilents that is) went extinct in the P-T extinctions leaving only primative small herbivores equivilent to ornithopods as the last Dinosaurs during the first period of the Mesozoic as Crocodilians and Pterosaurs take predator niches forcing the last Dinosaurs into advancing as herbivores and that alone. The herbivorous Dinosaurs became to big for Pterosaurs and to armored and fast for the Crocodilians so Dinosaur evolution started to change direction. herbivore Dinosaur populations explode as predator populations plumit. The extinction that follows is devastating mostly to the land with minor effects on the oceans though in the Cretacious this extinction will have a climate backlash and of course cause a new food chain to form. In the new Cretacious food chain Dinosaurs have made a come back as carnivores along with new smaller herbivores and omnivores for the first time. These groups are diversifying greatly creating ape analoges to take advantage of flowering plants which have almost replaced the old groups after the extinction. These apes would by the end of the Cretacious produce Bird like animals which would master flight and eliminate Pterosaurs as the ice ages come into being. The Pterosaurs are lucky compared to Crocodilians which will along with the sea reptiles will be finished off by the K-T extinction and new competitors descendent from more adaptible Dinosaurs taking their niches, the lineage that replaces Crocodillians and the Bird equivilents will be the last Dinosaurs after the K-T extinction and while they do diversify afterwards the Reptiles having been advancing in the niches of Mammals will take over and smash most of the compitition into place. Comments are welcome and appreciated so please post. Edited by ATEK Azul, Oct 19 2009, 04:48 PM.
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| I am dyslexic, please ignore the typo's! | |
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| Carlos | Oct 19 2009, 05:01 PM Post #2 |
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Adveho in me Lucifero
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Maybe archosaurs could evolve in different lines altogther in this world. Maybe instead of clear crurotarsans and ornithodirans archosaurs produce a large variety of groups that produced forms that resemble members of those groups. For example, maybe the waters are taken by creatures similar to phytosaurs or crocodillians but that are different; maybe more hydrodynamic without armours and perhaps capable of producing ovovipary. Maybe the skies are taken by archosaurs with bird and pterosaur like characteristics, or based of Shuvosaurus and kin. Maybe dinosaurs never evolve and instead the dominant archosaurs are a menagerie of quadrupedal carnivores, omnivores and herbivores |
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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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| Venatosaurus | Oct 19 2009, 05:05 PM Post #3 |
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HAUS OF SPEC
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Yes, you can go crazy with this world. Why not have pterosaurs too produce dominant terrestrial forms...like long-legged chasers, and oddly ornamented omnivores etc etc. And during the Jurassic lizards (aka squamates) do strange things, and maybe even gain endothermy, erect gaits, and really change what the rest of the Mesozoic would look like ! |
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| ATEK Azul | Oct 20 2009, 12:07 PM Post #4 |
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Transhuman
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Thanks for the ideas they are interesting and could be added in some way as my 1st post was only an example of what this world was and also kind of a base to build on. I was thinking of modern vertebrate flyers as Quadropedal Birds with wierd decorations on the head and very colorful Feathers and scales maybe even with 4 wings(all of wich can support the bodys weight). More comments are welcome. |
| I am dyslexic, please ignore the typo's! | |
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| The Dodo | Oct 23 2009, 02:11 AM Post #5 |
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Prime Specimen
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Since your bird equilvants are quadrapeds maybe they could get larger than our birds since they have 4 legs to help them take off with. |
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| ATEK Azul | Oct 23 2009, 04:42 PM Post #6 |
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Transhuman
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That was my thought as well along with allowing more ways to diversify. Though the display structures wiegh them down a little in flight. |
| I am dyslexic, please ignore the typo's! | |
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| Holben | Oct 24 2009, 11:01 AM Post #7 |
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Rumbo a la Victoria
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Bigger than teratorns? |
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Time flows like a river. Which is to say, downhill. We can tell this because everything is going downhill rapidly. It would seem prudent to be somewhere else when we reach the sea. "It is the old wound my king. It has never healed." | |
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| Carlos | Oct 24 2009, 11:21 AM Post #8 |
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Adveho in me Lucifero
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Well, duh. Bipedal birds are quite restricted in size thanks to relying solely on their backlegs, while animals that take off on all fours will get quite larger. Look at the average size of pterodactyls and the average size of birds; even if birds did compete in terms of size with the larger pterosaurs (except the largest azhdarchids), only pelagornithids and teratorns had an average size above that of modern condors and albatrosses |
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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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| Holben | Oct 24 2009, 11:27 AM Post #9 |
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Rumbo a la Victoria
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You calling me a duh?!? How about a bird on a spring? Ha! |
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Time flows like a river. Which is to say, downhill. We can tell this because everything is going downhill rapidly. It would seem prudent to be somewhere else when we reach the sea. "It is the old wound my king. It has never healed." | |
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| ATEK Azul | Oct 24 2009, 11:43 AM Post #10 |
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Transhuman
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I am not sure what teratorns are but I was thinking these might range from small Birds to Pterosaurs in size. Thanks for posting and please keep it up. |
| I am dyslexic, please ignore the typo's! | |
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| Holben | Oct 24 2009, 11:44 AM Post #11 |
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Rumbo a la Victoria
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Teratorns were the largest ever group of birds, including the largest Argentavis Magnificens. Except elephant birds. But Phosphuracos was heavier, and all that. |
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Time flows like a river. Which is to say, downhill. We can tell this because everything is going downhill rapidly. It would seem prudent to be somewhere else when we reach the sea. "It is the old wound my king. It has never healed." | |
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| The Dodo | Oct 24 2009, 07:23 PM Post #12 |
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Prime Specimen
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Teratorns where the largest flying birds and were related to condors. So these birds evolved from herbivorous dinosaurs didn't they? |
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| ATEK Azul | Oct 24 2009, 07:57 PM Post #13 |
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Transhuman
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Kinda think of it like that exept these Dinosaurs evolved earlier in the Permian losing most of their early diversity including all carnivores during the P-T extinction, they later exploded in herbivore diversity and size during the second age of the Mesozoic which soon went extinct thanks to food chain collapse as their predators died out and populations exploded. After that Dinosaurs became smaller and even developed new carnivores to replace the Crocodillians and Pterosaurs during the Cretacious. I went off track sorry. The Birds evolved from omnivorous Ape like Dinosaurs that become extinct shortly after the K-T extinction as Birds and Advanced Squamates(is that what lizards are?) replace their weakened diversity, they were the last true Dinosaurs known to have lived(which does not include the aquatic and flying members that have diverged enough that only classification can put them together) |
| I am dyslexic, please ignore the typo's! | |
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| The Dodo | Oct 24 2009, 08:04 PM Post #14 |
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Prime Specimen
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They'd make an interesting New Zealand, feathered, quadrapal grazers and maybe giant flying eagle-like animals as top predators. When you say advanced squamates what makes them advanced? Do they have a warm-blooded metabolism or something? |
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| ATEK Azul | Oct 24 2009, 10:30 PM Post #15 |
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Transhuman
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Well the ancestors of the advanced Squamates(I think those are the lizards can some one tell me?) If you can call them that any more, have been occupying small Synapsid other small niches since the Permian forcing them to adapt to Mammalian pressures eventually becomming simular to the reptiles of several versions of the Squamazoic along with some unique features I am still trying to come up with. The advanced Squamates are what became dominant in the large niches after the Mesozoic extinction while the older smaller niches are taken by true Squamates. |
| I am dyslexic, please ignore the typo's! | |
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