Dinosaur Evolution: A Journey from Tetrapod to Bird

Xenotaris

Okay before I get in to direct Dinosaur evolution I must first weave the tale of how these guys came along, okay lets start with the Fish that crawled out of the water otherwise it would be a drag explaining the evolution of fish.

Okay along time ago back around the Devonian time, a group of Lobe-fin fishes gradually evolved lungs and slowly crawled out of the water on to land to possibly escape from hungry predators.

These fish became the first Tetrapods or Amphibians, millions of years later and millions of generations later prototreptile amniotes then evolve from Reptiliomorph amphibians during the Carboniferous peroid, officially around the Pennsylvanian Epoch but it is possible they could of appear in the Mississippian epoch.

Animotes later diverged in to two clades: Synapsids (Mammal-like Reptiles and later Mammals) and Sauropsida (Classic Reptiles).

Now since we are going in to later dinosaur evolution we can mark out the Synapsids from the discussion since that would be a topic for a later time.

Sauropsida is then divided into Parareptilia (at the side of reptiles) and Eureptilia (True Reptiles)

Eureptilia later gives rise to several lizard-like early reptiles and then the clade Romeriida evolves which will give rise to Diapsid reptiles (Modern Reptiles and their extinct relatives)

Diapsid Reptiles would evolve in to several primitive forms before two notable clades would eventually win out so to speak. Lepidosauromorphs (Snakes, lizards, Tuatara, and their extinct relatives like mosasurus) and Archosauromorphs (Ruing Reptiles). Pantestudines in my opinion belongs with Archosauromorph due to DNA and Fossil record backing. This ends the Permian peroid.

Archosauromorphs, now where getting closer. After several basal clades we finally get Archosauriformes. Most Archosauriformes roughly resembled crocodiles if more lightly armored to barely armored but lets flash forward to the clade of Archosauria; seeing as the other Archosauriformes are no long relevant to this topic. Which happens mostly in the Early Triassic.

Archosauria can be divided in to two super clades: Avemetatarsalia/Ornithodira and Pseudosuchia (Crocodilans and their extinct relatives like the Rauisuchians)

Avemetatarsalia also known as Ornithodira or Pan-Aves is the clade that holds the Pterosauromorphs and the Dinosauromorphs.

Dinosauromorphs clade contains all Dinosaur clades including modern birds and their extinct relatives. Dinosauromorphs that were closer related to true Dinosaurs were Dinosauriformes while Non-dinosaurian dinosaurmorphs belong to Lagerpetids.

Dinosauriformes housed several dinosaur-like forerunners but the most developed group besides the dinosaurs themselves were the Silesaurids. These creatures appeared roughly in the Middle Triassic.

And now we finally arrived to the clade Dinosauria which itself is broken up in to two major clades: Ornithischia (Bird-hip Dinosaurs) and Saurischia (Lizard-hip Dinosaurs) both arrived in the Late Triassic.

Ornithischia can be splitted up in to three primary clades: Ornithopods (basically beaked bipeds and duckbills), Thyreophora (Plated and armored dinosaurs with attack tails), and Marginocephalia (Head Armored Dinosaurs)

Saurischia is simply divided in to two clades: Sauropodomorphs (Long Necked herbivores) and Theropods (Bipedal Carnivores, later some beaked long necked bipedal herbivores, and birds)

The earliest members of Saurischia were fairly theropod-like but we do know the earliest members of each clade. Eoraptor long suspected to be a primitive theropod or even a basal Saurischia is now thought to be a primitive sauropodomorph along with the similar Guaibasaurids while Eodromaeus snags the spot of the Eoraptors previous position as an early theropod along side the slightly more advanced Herrerasaurids.

Kamoebas V.6

Guys,i wanted to tell ya something...

EDB Season 2 is cancelled...

I just don't have the time...

I don't just simply make it...

And,its hard...

Xenotaris

Gmkgoji: GENETICS DISAGREES WITH YOU!

Jawless fish are not same as Cartilaginous fish or Bony fish.

Cartilaginous fish are not the same as Bony Fish

Hell Bony fish are not the same as Bony Fish as we have Rayfin fish and Lobefin fish.

We do have evidence of a plethora of extinct fossil species of Fish that evolved legs to climb out of the water. That is how we get amphibians, to deny that is to be an idiotic creationist!

TheLazyFish

... wut? Also, if that story is true, then ever living creature commits incest every day. Also, what happened to all the creatures that are extinct now? Don't tell me there wasn't enough room for a couple of Petrolacosaurus or Micropachycephalosaurus! Besides that, how did he manage to capture two of every single creature from across the globe? Or even his own country or lands? Also, that means TONS of creatures would have died out, because as soon as they were released there would be conflicts, and each creature would lose one of the principal members of their species. Also, they wouldn't have been able to adapt! And the carnivores would prey on the last two herbivores they can, and then die. And the plants! There would be nothing for the herbivores to feed on! Hell, there wouldn't have been anything left for US to eat, at least not before a few months of farming! Also, citing Noah's Flood, an event that makes no sense and there's no evidence for happening, is not evidence. Lastly, they'd all be stuck in the same environment, so they probably would have only adapted to the one environment... if any of them even survived. The only ones that may stand a chance of surviving are mosquitos and house flies... even then! Plus, if that's true, then we shouldn't have such diversity anyways, because it would have only been a few thousand years and so we wouldn't have friggin moas, emus, pigeons, etc. Also, how did anything get to Australia?!!!

Gmkgoji

Xenotaris, are you fucking insulting me? By calling me an idiotic creationist?

Xenotaris

Not to mention a population born of two of each animal would be doom to extinction within several generations, I would like to say by 10th generation.

TheLazyFish

He's not calling you an idiot, he's just saying denying evidence would be acting like an idiotic creationist, more of a caution really.

Xenotaris

We have been providing evidence that macro-evolution is real, If there was no species of cats how come Cheetahs and Leopards can't reproduce from one or another? Because they belong to two different cat subfamilies, two different genus, and two different SPECIES! GENETICS DISPROVES YOU!

Gmkgoji

Rgh, Fine. If yall cant tell, i am PISSED

Xenotaris

Yeah what LazyFish said

Xenotaris

I need to make a spinoff topic about Cat evolution

TheLazyFish

Ok everyone, calm down. I know it's infuriating to hear that... but we should all take a moment to not turn this into another screaming match. I mean come on, we aren't trying to troll one another or something like someone I know...

Gmkgoji

Also, I'm not denying the existence of species, i'm just saying that all species of a specific kind of animal evolved from two animals of a specific kind.

Gmkgoji

The sea animals have more diversity due to not having to get on a giant wooden ark.

Xenotaris

Yes but those two animals would have died off due to  inbreeding, they wouldn't be able to evolve into the many species we today because they would have died off by the 7th or 10th generation due to birth defects, its the reason why you don't marry your brother or sister and have sex with them.

Xenotaris

Also freshwater animals and salt water animals can not live in the same water, if there was a great flood, all the freshwater fish would have died off real quick. 

TheLazyFish

... And? I brought up BIIIIIIIIRDS

Gmkgoji

How the heck do you think the geologic column got formed? Not by time periods, but by a FLOOD. Only in rushing water does sand, clay, and rock stack like that. 

TheLazyFish

What he said.

Gmkgoji

I feel like i'm being crushed by a giant rock.

Xenotaris

Yes local floods, not global floods.

Xenotaris

I am now going to return this forum post back to its original topic and that is DINOSAUR EVOLUTION

TheLazyFish

... Goji... that isn't from a bunch of water at once, that's water falling over time. And mud. You know... like oceans or swamps... not floods... also, that's why the grand canyon has so many lines, it was a river that dried up. Not FLOODED. If it was flooded the lines wouldn't be so distinct, especially if the flood fell down as quickly as the Bible says.

Gmkgoji

Back to Dinosaur evolution? Okay.

Dinosaur's are still alive today. I don't mean birds, I mean the cryptids like Mokele-Mbembe.

Xenotaris

Birds evolved from small feather dinosaurs, the fact that we have fossils that show birds steadily becoming more birdlike and less dinosaur-like was evident in the late cretaceous 

TheLazyFish

Anyways, you do you Xenotaris. Excited for the next part.

Goji, if you want to continue an evolution discussion, make another topic and leave this topic to what it was originally discussing pls. If you do... looking forward to it. AND WATCH THE FRIGGIN VID-

Cut off for putting too much effort.

Xenotaris

Well living fossils do in fact exist but it doesn't contradict evolution, it just managed to survive its extinction. That is for another topic

Gmkgoji

Not gonna happen. I'm pissed off rn, and debating rn will give me a headache. My only wish is that you two will truly see that the diversity, the beauty, the awe of the natural world did not happen by chance.

Xenotaris

Well i'm not denying the existence of God or gods, we are just saying that creationism is unrealistic and evolution is more of a realistic explanation. You can believe in God and believe in Macro-evolution, I think God or gods would allow their creations to evolve on their own and perhaps even make small adjustments similar to how we changed the wolf into a plethora of different dog breeds.

Xenotaris

Okay on to Dromaeosaurid evolution

Gmkgoji

Believe what you want.