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Dinosaur Evolution: A Journey from Tetrapod to Bird

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Xenotaris

MemberAllosaurusOct-18-2016 6:26 AM

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.

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Well yes, dromaeosaurids are the closest to birds.

"Part of the journey is the end..."

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Sci-Fi King25
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Thanks for sharing this with us. :) I like all the details about how dinosaurs evolved.

“Banana oil.”- George Takei, Gigantis: The Fire Monster

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Xenotaris
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Your welcome, Dinosaurs are my passion.

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GG
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^We can all agree on dinosaurs being our passion.

Alright man, hey I'm just stating what paleontologists and news websites have reported. It is indeed your view against the rest of the World. Although your view makes a good deal of sense. Based on the blood vessel they found of the Tyrant King--chicken shares the most similarities to T.rex, closer than any other bird. Therefore, it is its closest living relative.

Good grief.

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Xenotaris
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Actually I found some sights that said that Chickens  and their relatives are just more basal theropod like not exactly being part T. rex

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So they may be part raptor too?

Dinosaurs incredible creatures who roamed the Earth 65 million years ago. Never had nature been filled with so much terror and beauty...

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Xenotaris
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Chickens being a member of the modern bird clade/group shares a close common ancestor (its closests relative) to Dromaosaurids (Raptors) and Troodons. The Chicken does not share a common ancestor with Tyrannosaurids, it does share a distant common ancestor with Tyrannosauroids but so do all Coelurosaurians.

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Xenotaris
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Now I would like to move on to Tyrannosaurus evolution. The early basal Tyrannosauroids belong to a subclade called Proceratosaurids it was called this back when scientists used to think they were primitive ceratosauruses. Now Proceratosaurids have been reclassified as early Tyrannnosauroids rather than basal Ceratosaurids. Tyrannosauroids are a clade of animals that include basal Tyrannosauroids like Dilong and Guanlong, as well as the advanced Tyrannosauroids, the ever popular Tyrannosaurids with Tyrannosaurus rex as its crowning member.

Now early Tyrannosauroids like Dilong and Guanlong may have been somewhat raptor-like but only because they are both Coelurosaurians and they occupied a similar niche to larger dromaeosaurids but unlike the later dromaoesaurids, these basal tyrannosauroids lacked flight feathers as they were only covered in protofeathers and unlike the latter dromaoesaurids they couldn't glide or had power flight; a trait that defines paravians such as Dromaoesaurids, Troodontids, and Avians but not the Tyrannosauroids.

Other basal Tyrannosauroids include Juratyrant, Proceratosaurus, Sinotyrannus, and Yutyrannus. Later we start seeing more advanced Tyrannsauroids such as Eotyrannus, Raptorex, Bagaraatan, AlectrosaurusAppalachiosaurus, and Alioramus before proper Tyrannosaurids make an appearance.
Now we are on to the Tyrannosaurids, we have the basal Gorgosaurus and Albertosaurus and the more advanced Tyrannosaurians such as Daspletosaurus, Teratophoneus, Bistahieversor, Lythronax, Tarbosaurus, Zhuchengtyrannus, and finally Tyrannosaurus.

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Darth Shiro
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Interesting! I love this post we should gather Dinosaur fans here.

Dinosaurs incredible creatures who roamed the Earth 65 million years ago. Never had nature been filled with so much terror and beauty...

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Xenotaris
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Indeed

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I will contact Lord Tyrant and maybe Raptor-401.

Dinosaurs incredible creatures who roamed the Earth 65 million years ago. Never had nature been filled with so much terror and beauty...

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Xenotaris
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sweet!

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finished

Dinosaurs incredible creatures who roamed the Earth 65 million years ago. Never had nature been filled with so much terror and beauty...

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Xenotaris
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As much as I love Jurassic-Cretaceous dinosaurs, I find earlier Triassic Dinosaurs more fascinating because of their more basal routes and I'm fascinated with early dinosaur evolution. I know its easier to love Utahraptor, Tyrannosaurus, Velociraptor, Triceratops, Apatosaurus, Parasaurolophus, Ankylosaurus, Stegosaurus, Brachiosaurus, or even Spinosaurus but Triassic dinosaurs were like the great grand parents of the more famous dinosaur clades.

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Yeah! My favorite Triassic dinosaur is Gojirasaurus quayi! For the Jurassic i must say Allosaurus and finally for the Cretaceous period Spinosaurus who's also my favorite dinosaur. I also like Styracosaurus and Brachiosaurs.

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Xenotaris
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Ah Gojirasaurus, a rather large Coelophysoid. Hey its not too distant from my favorite dinosaur, Dilophosaurus.

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Yup! I love Gojirasaurus because as a Coelophysoid it is HUGE!! Like Godzilla as you see in my profile pic.

Dinosaurs incredible creatures who roamed the Earth 65 million years ago. Never had nature been filled with so much terror and beauty...

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Xenotaris
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Hey it might of had competition with another large coelophysoid Liliensternus. although my Dilophosaurus is bigger but Dilophosaurus is an Early Jurassic Theropod with the body of a Late Triassic Theropod. Dilophosaurus a while back was considered to be a Coelophysoid before being placed in its own clade Dilophosauridae.

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Yeah.

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Gojirasaurus is my favourite Triassic dinosaur

"Part of the journey is the end..."

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