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Dinosaur Evolution: A Journey from Tetrapod to Bird

Dinosaur Evolution: A Journey from Tetrapod to Bird

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Xenotaris

AllosaurusMember4251 XPOct-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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171 Responses to Dinosaur Evolution: A Journey from Tetrapod to Bird

Kamoebas V.6

StegosaurusMember765 XPOct-07-2019 12:31 PM

This,this,IS A CONFLICT!

TheLazyFish

VelociraptorMember1630 XPOct-07-2019 12:32 PM

A conflict that's ending, so SSHHHHHHHH

If people weren't lazy, we wouldn't try to be efficient. If we weren't efficient, we'd never get anything done.

Gmkgoji

VelociraptorMember1789 XPOct-07-2019 12:33 PM

And with no clear winner.

NEXT TIME ON DEATH BATTLE

Zwei Wing is the best singing duo. Change my mind.

TheLazyFish

VelociraptorMember1630 XPOct-07-2019 12:34 PM

Lol

(Me internally) Nobody dispute outcome nobody dispute outcome NOBODY DISPUTE OUTCOME

If people weren't lazy, we wouldn't try to be efficient. If we weren't efficient, we'd never get anything done.

Kamoebas V.6

StegosaurusMember765 XPOct-07-2019 12:39 PM

Guys,this is a world record of most replied topic!

TheLazyFish

VelociraptorMember1630 XPOct-07-2019 12:40 PM

... On the Dinosaurs topic, probably.

If people weren't lazy, we wouldn't try to be efficient. If we weren't efficient, we'd never get anything done.

TheLazyFish

VelociraptorMember1630 XPOct-07-2019 12:40 PM

 Forum*

If people weren't lazy, we wouldn't try to be efficient. If we weren't efficient, we'd never get anything done.

Xenotaris

AllosaurusMember4251 XPOct-07-2019 12:43 PM

Yeah it went from a Topic about Dinosaur Evolution to arguing about Evolution vs Creationism.

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TheLazyFish

VelociraptorMember1630 XPOct-07-2019 12:46 PM

... Basically any topic about evolution IRL...

If people weren't lazy, we wouldn't try to be efficient. If we weren't efficient, we'd never get anything done.

MinecraftDinoKaiju

StegosaurusMember968 XPOct-07-2019 1:32 PM

@Xenotaris Two things:

1) This is an awesome topic, so I really hope we go back on topic. Also, this is teaching me more about the evolutionary history of dinosaurs than any book, documentary, or movie I ever read or saw. Awesome job.

2) Maybe that should be a separate topic to talk about (considering how important it actually is) : Evolution VS Creationism.

TheLazyFish

VelociraptorMember1630 XPOct-07-2019 1:39 PM

Yeah, this topic is pretty similar to most of my studies on it over the past few years. One thing, could you do a post explaining the theories behind Megaraptorid evolution?

 

Also MDK, on your second point... Well I agree, but actually I disagree. I mean... just look what happened here... but, it could do some good... I could post video links in the comment section, like how we've actually seen evolution happen over the course of a few decades in a process known as Rapid Evolution.

If people weren't lazy, we wouldn't try to be efficient. If we weren't efficient, we'd never get anything done.

Xenotaris

AllosaurusMember4251 XPOct-07-2019 3:03 PM

I do plan on tackling Dromaeosaurid evolution soon but Megaraptorids would be a fine topic too

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TheLazyFish

VelociraptorMember1630 XPOct-07-2019 3:15 PM

Cool. Could you also do Megalosauroid evolution? That one I'm a tad iffy on...

If people weren't lazy, we wouldn't try to be efficient. If we weren't efficient, we'd never get anything done.

Xenotaris

AllosaurusMember4251 XPOct-07-2019 4:08 PM

Didn't I partially cover that with the Spinosaurids?

Edit: Nevermind, I'll get on that too

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Xenotaris

AllosaurusMember4251 XPOct-07-2019 9:30 PM

Well I pretty much covered most of how the Dromaeosaurids came to be via the evolution of Birds.

Okay lets start off with the basal dromaeosaurids: LuanchuanraptorPyroraptorShanag, and Zhenyuanlong.

The dromaeosaurids were then broken into three distinct subfamilies:

The small and very bird-like HalszkaraptorinaeHalszkaraptorHulsanpesMahakala

The South American and Antarctican UnenlagiinaeAustroraptorBuitreraptorNeuquenraptorPamparaptorRahonavisUnenlagiaUnquillosaurus?

The double winged MicroraptoriaChangyuraptorGraciliraptorHesperonychusMicroraptorSinornithosaurusTianyuraptorZhongjianosaurus

The classic Eudromaeosauria which itself was divided into three tribes: Saurornitholestinae were medium sized eudromaeosaurians of the likes of AtrociraptorBambiraptorSaurornitholestes

Velociraptorinae were small eudromaeosaurians with elongated snouts like the AcheroraptorAdasaurusBoreonykusLinheraptorTsaagan, and its most famous member the Velociraptor

Dromaeosaurinae were large, heavy skulled, and heavily built eudromaeosaurians like the giant Asian Achillobator, the JP Raptor sized Dakotaraptor, the inspired JP Raptor DeinonychusDromaeosaurusItemirus, the giant UtahraptorYurgovuchia, and Zapsalis


Undetermined: DromaeosauroidesNuthetesOrnithodesmusVariraptorPamparaptor?,

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TheLazyFish

VelociraptorMember1630 XPOct-08-2019 9:01 AM

Noice.

If people weren't lazy, we wouldn't try to be efficient. If we weren't efficient, we'd never get anything done.

Xenotaris

AllosaurusMember4251 XPOct-08-2019 9:06 AM

next will be Megaraptorids

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TheLazyFish

VelociraptorMember1630 XPOct-08-2019 12:05 PM

Yes!

If people weren't lazy, we wouldn't try to be efficient. If we weren't efficient, we'd never get anything done.

Kattozilla

BrachiosaurusMember1447 XPOct-26-2019 9:35 AM

Dinosaurs back then: https://www.youtube.com/watch?v=Q3iElEt-k4g

Dinosaurs now: https://www.youtube.com/watch?v=wsaGeFfPCY4

"Chokichokichoki!"

Xenotaris

AllosaurusMember4251 XPOct-26-2019 10:00 AM

@Flyleaf-Rapt0r lol, yep, evolution at its finest. You start off small and cute looking then you evolve into something big and scary then suffer an extinction event then evolve back into something small and cute

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Kattozilla

BrachiosaurusMember1447 XPOct-26-2019 10:10 AM

screm hard

"Chokichokichoki!"
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