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paleonativeart · 10 months

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Day 3: Dromaeosaurus albertensis is standing for rest.

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alphynix · 2 years

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It Came From The Wastebasket #12: Coelurosaur Confusion

Historically Coelurosauria was the counterpart to the Carnosauria, with both of them representing two major lineages of theropod dinosaurs.

Created as a group in the early 20th century, coelurosaurs quickly became a dumping ground for all small-bodied theropods – including coelophysoids, compsognathids, ornithomimids, oviraptorosaurs, dromaeosaurids, and troodontids– and for a while this wastebasket taxon also included the large-bodied ceratosaurids and tyrannosauroids, before they were moved over into the carnosaurs.

But during the 1960s and 1970s this arrangement began to break down. A better understanding of groups like dromaeosaurs revealed a confusing mixture of traditional "carnosaur" and "coelurosaur" anatomical features, and paleontologists struggled to figure out where these sorts of theropods actually fit in.

The development of cladistic methods from the 1970s onwards led to efforts to clean up the coelurosaur wastebasket, trying to figure out a more accurate version of these animals' evolutionary relationships. After briefly collapsing Coelurosauria down to just coelophysoids and "coelurids", the growing recognition of modern birds as living theropod dinosaurs eventually resulted in the group being properly redefined in the 1980s as "birds, and all theropods closer related to them than to carnosaurs".

Clockwise from the left (not to scale): Citipati osmolskae, Albertosaurus sarcophagus, Yi qi, Sinosauropteryx prima

The coelophysoids were finally removed entirely, reclassified as a much earlier branch of theropods – but quite a few of the other groups from earlier concepts of Coelurosauria survived this reshuffling, with the compsognathids, ornithomimids, oviraptorosaurs, dromaeosaurs, and troodontids all proving themselves to have really been closely related the whole time. Meanwhile the tyrannosauroids were brought back in, along with the therizinosaurs, alvarezsauroids, and a whole bunch of paravian and avialan lineages.

(Megaraptorans might belong somewhere in the coelurosaurs, too – possibly being tyrannosauroids – but their classification is currently being disputed.)

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Nix Illustration | Tumblr | Twitter | Patreon

#it came from the wastebasket #wastebasket taxon #taxonomy #coelurosauria #theropod #dinosaur #paleontology #art #science illustration #paleoart #palaeoblr

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peregrinethegryphon · 11 months

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Some really nice sketches I found from last year when I was trying to make a dino fursona.

#dinosaur #maniraptora #coelurosauria #guanlong #velociraptor #raptors #my art

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vees-strangeworld-omniverse · 7 months

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COMMON DINOSAUROIDS OF THE OMNIVERSE

(NOTE: descriptions copy-pasted from DA where i normally/originally post my works. any context that is missing here on tumblr can be found on my DA [linked here and on pinned post] )

so, like, idk one day i was just in the mood for drawing some of every speculative evolutionist's favorite paleo-related topic. then I realized I had a bunch of dinosauroids I've create in my pre-strangeworld days, and though i'd redesign them as well. thus, all of these guys (except for the ornitimen) are basically just redesigns of mspaint drawing. so, here are a sample of the various sentient archosaurs you'll come across in the omniverse.

a thing to note is that usually all these guys would be wearing clothing or accessories of sort, but i omitted that so you could have a better look at their design.

[tumblr note: also, two of these guys will make mention of Reptilians, or at least this omniverse's version of it. the one linked here is my second rendition; i may end up doing a third rendition, or at least do some minor updates on their descriptions]

troods troods are your pretty average troodontid-descendant dinosauroid, and they're more specifically a descendant of troodon itself. their universe is your usual non-kpg extinction timeline, though instead of the asteroid missing earth it hits mars instead. being 3ft at the hips, they don't look too far off from your average troodon, either, probably because their ancestors were already smart animal and only needed till the late Oligocene to evolve into a fully-fledge sophonts. the trood's colors ranges between black, gray, silver and blue, and have darker topside which gradually becomes lighter towards the bottom. they also have a little poof of feathers on their head, which similar to us the females have it more fuller than the males. not much is known about their original culture, say for the fact they were between a hunter-gatherers and permanent civilizations.

ornitimen contrast to the troods, ornitimen are'nt a naturally-evolved species, rather they're an uplifted sophont that's kinda a weird mix between different small ornithschian species (dryosaurus, kulindadromeus and hypsilophodon being some of the major contributors). they were created by the reptilians, initially being their servants. however, over the century they became less of servants and more of free beings. still, alot of their culture clings onto what they did as servants, especially the arts and labor. ornitimens have different races, which were created for specific jobs. they stand between 2ft-4ft tall, with the smaller ones being used for art and delicate tasks and larger ones used for hard labor and transportation of items. their colors come in the varying shades, hues and markings of neutral colors, yet always have a colorful neck, which is most vibrant in males.

bevornis bevornis comes from an alternate version on the trood's universe, in which instead of the troodons becoming the sophonts it was a species of oviraptor. unlike the troods, their initial culture is pretty well known for it's "No bullshit" kind of deal. most bevornids, even females and children, focused on their strength and ability to fight in battles. the children are taught from a young age how to fight and defend themselves. even as their culture expanded beyond battles and wars, they still are often proud of their physical strength. bevornids look similar to other existing oviraptors, say for their more upright stance. the males have a magenta-ish color on their tail, arms and crest, while the females and children lack those colors. they're roughly the same size as a grown human, if not slightly more robust. their colors can vary depending on race and location, but for the most part it's usually slightly different shades of beige and blonde, still having the dark brown stripes on their face and rear end.

kavoids kavoids look like one of those generic fantasy feathered dinosaur, with the green body and vibrant feathers. they're some kind of coelurosaur descendant, most likely a compsognathid or something similar. the come from an alternate early-cretaceous period from a small island continent, and they're culture is also a bit of a mystery aside from the fact that females are often more dominant than males. kavoids stand 4ft at the hips, and are very lean and fast. they have varying hues of green with a yellowish underbelly and darker stripes. they have display feather not only on their tail and arms, but also their spine and head (which is more of a frill). these display feathers are very colorful and vibrant, and are an indicator of individuals and gender; females have their display feathers consist of warm colors, while the male's are more of cool colors.

sapiotyrannus much like the ornitimen, the sapiotyrannus is an uplifted species created by the reptilians as heavy-labor servants before eventually becoming free beings. unlike the ornitimen, they're not a hybrid of various animals, rather they're a yutyrannus descendant given bigger, more dexterous hands. both sapiotyrannids and ornitimen tend share their civilizations together, since the ornitimen and expert farmers and the sapiotyrannids are vital guardians. the sapiotyrannus is roughly the same size as it's yutyrannus cousins, and is covered almost entirely by feathers. they're always brownish in colors, with "faun"-like spots going down their back. they're very little difference between sexes, and the only real indicator is that females are slightly bigger than males.

senjias senjias are the only ones here that aren't actually dinosaur, rather instead they're a descendant of rhamphorhynchoid pterosaur (possible kunpengopterus). coming from an island, they're mostly hunter-gatherers, foraging for both fruits and whatever the ocean gives them. they also go out to sea on little boats so they can fish for whatever they can find. senjias aren't that big, only standing about 2ft tall. they not only have an opposable thumb, but also an opposable tail. they're also still capable of gliding, which is necessary since they live in the trees. all of them are solid shaded of brown, with a darker mane going on their back. females have red eyes, and males have blue eyes.

man, i need to make more of these guys sometimes.

#sophont #troodon #dinosauroid #pterosaur #sentient #troodontid #tyrannosaurus #feathered dinosaur #ornithischian #oviraptorosaur #tyrannosauridae #coelurosauria #speculative evolution #speculative biology #rhamphorhyncoidea #yutyrannus

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fundinofactoftheday · 2 years

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Dinofact #40

Proceratosaurus, a small theropod carnivore, was originally thought to be an ancestor of Ceratosaurus, due to the crest on its head resembling that of Ceratosaurus. However, it is now considered a coelurosaur, specifically a member of Proceratosauridae, whereas Ceratosaurus is a Ceratosaurid. Proceratosaurus may be one of the earliest members of Tyrannosauroidea.

Source: wikipedia [1], [2]

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extinctworld-ua · 2 years

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Aorun

Aorun — вимерлий рід хижих динозаврів-теропод, вперше виявлений у 2006 році, але науковий опис опубліковано лише в 2013 році. Це один із найстаріших відомих динозаврів-целурозаврів і, за оцінками, жив близько 161,6 мільйона років тому під час пізнього юрськ��го періоду. Це п’ятий теропод, виявлений у Вукайвані.

Повний текст на сайті "Вимерлий світ":

https://extinctworld.in.ua/aorun/

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a-dinosaur-a-day · 10 months

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Birds are class Aves.

Sure, under Linnaean taxonomy. But, well,

A) Linnaeus was a eugenecist so his scientific opinions are suspect and his morality is awful

B) he didn't know about evolution

C) he didn't know about prehistoric life

so his classification system? Sucks ass. It doesn't work anymore. It no longer reflects the diversity of life.

Instead, scientists - almost across the board, now - use Clades, or evolutionary relationships. No rankings, no hierarchies, just clades. It allows us to properly place prehistoric life, it removes our reliance on traits (which are almost always arbitrary) in classifying organisms, and allows us to communicate the history of life just by talking about their relationships.

So, for your own edification, here's the full classification of birds as we currently know it, from biggest to smallest:

Biota/Earth-Based Life

Archaeans

Proteoarchaeota

Asgardians (Eukaryomorphans)

Eukaryota (note: Proteobacteria were added to an asgardian Eukaryote to form mitochondria)

Amorphea

Obazoa

Opisthokonts

Holozoa

Filozoa

Choanozoa

Metazoa (Animals)

ParaHoxozoa (Hox genes show up)

Planulozoa

Bilateria (all bilateran animals)

Nephrozoa

Deuterostomia (Deuterostomes)

Chordata (Chordates)

Olfactores

Vertebrata (Vertebrates)

Gnathostomata (Jawed Vertebrates)

Eugnathostomata

Osteichthyes (Bony Vertebrates)

Sarcopterygii (Lobe-Finned Fish)

Rhipidistia

Tetrapodomorpha

Eotetrapodiformes

Elpistostegalia

Stegocephalia

Tetrapoda (Tetrapods)

Reptiliomorpha

Amniota (animals that lay amniotic eggs, or evolved from ones that did)

Sauropsida/Reptilia (reptiles sensu lato)

Eureptilia

Diapsida

Neodiapsida

Sauria (reptiles sensu stricto)

Archelosauria

Archosauromorpha

Crocopoda

Archosauriformes

Eucrocopoda

Crurotarsi

Archosauria

Avemetatarsalia (Bird-line Archosaurs, birds sensu lato)

Ornithodira (Appearance of feathers, warm bloodedness)

Dinosauromorpha

Dinosauriformes

Dracohors

Dinosauria (fully upright posture; All Dinosaurs)

Saurischia (bird like bones & lungs)

Eusaurischia

Theropoda (permanently bipedal group)

Neotheropoda

Averostra

Tetanurae

Orionides

Avetheropoda

Coelurosauria

Tyrannoraptora

Maniraptoromorpha

Neocoelurosauria

Maniraptoriformes (feathered wings on arms)

Maniraptora

Pennaraptora

Paraves (fully sized winges, probable flighted ancestor)

Avialae

Avebrevicauda

Pygostylia (bird tails)

Ornithothoraces

Euornithes (wing configuration like modern birds)

Ornithuromorpha

Ornithurae

Neornithes (modern birds, with fully modern bird beaks)

idk if this was a gotcha, trying to be helpful, or genuine confusion, but here you go.

all of this, ftr, is on wikipedia, and you could have looked it up yourself.

#linnaean taxonomy #linnaeus #cladistics #phylogenetics #biology #evolutionary biology #paleontology

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kaijuthespacemaniraptorian · 7 months

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This wyvern has yet to have a proper genus but it is just named the Weird Wyvern for now! This bizarre flying wyvern from the pleistocene period is the descandant of the wyverns that where distant relatives of Nargacuga becoming fully bipedal and has evolved a variety of adaptations, it developped more facial muscularity, a more extensive respiratory system with air sacks in its neck. and by far the weirdest one it moved its cloaca at the tip of its tail, they exibit brood paratism behaviour as they use their tails to lay eggs in someone else's nests! This wyvern resembles alot like a bat although it isnt one and its a parave, this wyvern can shoot fire with specialized glands in its jaw almost analogous to komodo dragon venom glands, and uses soo much air from its air sacks to shoot the liquid soo fast it can become a flamethrower, it even shoots out fire from its tail although how it does it with its tail is unclear has this genus has been extinct, due to its many weird traits its clear its the common ancestor of Pukei, Paolumu and the cave wyverns,

Classification; Flying Wyvern Superorder; Dinosauria Order: Saurischia Suborder: Theropoda Infraorder: Coelurosauria Superorder; Wyvern Parave Family: ???

Size; 9 ft tall: 48ft long Elements: Fire Weakest To: ???

You can leave your thoughts down here on the replies i would love to see what you all think of this monster i made that would be appreciating ^w^!

i feel a bit better now but not that much but my god i needed to rest! il try my best to post more things in the future im dealing with college at this moment!

#monster hunter #art #monster hunter ecology #fanmade #monster

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paleobird · 5 months

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"Ava is it possible to learn which dino was an evolution of another just from their bones?" She asks with an honest smile. "I know people say that the Trex evolved into the chicken but I always assumed that was a joke"

"Oh yeah, absolutely! It's really the only way to classify extinct animals in general, since we can't use molecular genetics. Similar skeletal features are often shared across close relatives, called synapomorphies. For examples, the two primary clades of the Dinosauria, Ornithischia and Saurischia, are usually differentiated by their hip structure. Obviously, it's a lot more complicated than this, and a lot of the nitty-gritty details are still hotly debated here and there, but that's the basic gist of it! There's plenty of dinosaur cladograms online that demonstrate how they're all related to each other."

"Tyrannosaurus didn't evolve directly into a chicken, of course, bur both of them are classified undet the Coelurosauria, and have at least a couple shared traits. Chickens are much closer to Maniraptorans than Tyrannosaurs, though."

#piltoversharpshooter

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iamthekaijuking · 2 years

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was just admiring my favorite monster the Great Izuchi when I noticed it lacks the classic "raptor killing claws on its feet". This combined with its prominent hand claws suggest to me that they aren't Maniraptorans but possibly derived Megaraptorans, a dinosaur clade without much representation!

While Megaraptorans have traditionally been an ABSOLUTE PAIN to classify, switching back and forth between Coelurosauria and Carcarharodontosauria, the latest research this year may have finally placed them in the former possibly as a sister taxon to Tyrannosauroidea.

Megaraptorans have always been hard to classify given their weird hybridization of both primitive and derived avetheropodan features, and every few years their placement switches between tyrannosaurs and Allosaurs. It doesn’t really help that our knowledge of theropod evolution and classification right after the Triassic-Jurassic extinction is pretty iffy in some places (then again, so is our knowledge of nearly all life during the time period) and megaraptorans just kinda popped up in the early Cretaceous, which leaves us with a big evolutionary gap. Honestly I personally think that we won’t really know what megaraptorans truly are anytime soon if nothing short of a full skeleton is found. But hey keep entertaining the idea of a megaraptor izuchi if that’s what you like!

On my end though I don’t really think any of the dog wyverns save for maccao are close to my hypothetical bird/flying Wyvern parave family. In fact I don’t even think they’re maniraptorians. None of them have raptorial second toe claws (a key feature in early paraves), and jaggi and baggi actually have vestigial thumbs, which puts their finger count at four. Personally I’m on the fence with classifying Jaggi, Baggi, Wroggi, and Izuchi as either ceratosaurs (possibly specifically noasaurs), pre averostran neotheropods, or even late surviving herrerasaurs.

#ask #questions #the nerd beast #great izuchi #monhun #monsterhunter #monster hunter #monster hunter biology #speculative zoology #speculative evolution #speculative biology

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strawberrystarcake · 2 years

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remember the time i assigned u maiasaura as your dinosaur kin. i found that again and i STILL agree with it. u are the human embodiment of maiasaura and i mean that in the most /pos way possible

aw i love you too, human embodiment of several coelurosaurias in a trench coat <3

#layer after layer they hide ⁕ nico ° ↺͏͏ < ll >>#strawberrie speaks to you specifically

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paleonativeart · 5 months

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Enter Day 1 on #Dinocember Eotyrannus.

But with only less stressed prompt list by Emily Stepp for 15th day list.

So here’s my first inked Eotyrannus with both memory and reference.

#my art #dinosaur #paleoart #myart #dinosaurs #dinosauria #my drawings #sketchbook app #tyrannosauroidea #coelurosauria #sketchbookapp #artists on tumblr #dinocember

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alphynix · 2 years

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It Came From The Wastebasket #17: Getting Ornithomimus In Order

The ostrich-like "bird-mimic" dinosaur Ornithomimus was named in 1890, based on some hand and foot bones from Late Cretaceous-aged fossil beds in Colorado, USA.

The first ornithomimid known to science, it was initially thought to be a ornithopod, but then a few years later more fossil material revealed it was actually a theropod – and then it spent some time classified as a "megalosaur" before ornithomimids were finally recognized as being coelurosaurs in the early 20th century.

And for nearly a century after its discovery it was treated as a wastebasket taxon for any similar-looking fossil material from North America and Asia, with around 17 different species named within the genus. One of these was split off into Struthiomimus in 1917, but it wasn't until much later that the rest began to get sorted out.

A review of known Ornithomimus fossils in the early 1970s renamed a couple more species into the new genera Archaeornithomimus and Dromiceiomimus, and dismissed most of the remaining species as dubious or invalid. Just two valid species now remained: the original Ornithomimus velox from Colorado, and Ornithomimus edmontonicus from Alberta, Canada.

Ornithomimus edmontonicus

Since then opinions have gone back and forth about some of the other Ornithomimus species. For a while Dromiceiomimus was merged back into Ornithomimus, but more recently it's been found to have distinct limb proportions and was probably actually a separate genus after all. Another species that's usually considered to be part of Struthiomimus is also sometimes instead classified as an Ornithomimus instead.

Really all of the North American ornithomimids are in need of a modern taxonomic revision – especially since Ornithomimus edmontonicus shows enough anatomical variation that it might actually represent a species complex of multiple very similar forms, which might get split apart in the future if anyone can figure out how to reliably distinguish them.

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Nix Illustration | Tumblr | Twitter | Patreon

#it came from the wastebasket #wastebasket taxon #taxonomy #ornithomimus #ornithomimidae #ornithomimosauria #maniraptoriformes #coelurosauria #theropod #dinosaur #paleontology #art #science illustration #paleoart #palaeoblr

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tolkienosaurus · 1 month

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Where would you fit Megaraptorans in the dinosaur family tree?

#dinosaur #megaraptor #taxonomy #cladistics #dino

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skyland2703 · 1 month

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Tetanuran dinosaurs, a group in Theropoda enclosing of Coelurosauria and Carnosauria, likely could not taste spicy flavors as modern day birds are incapable of tasting spicy.

It’s technically possible for a blood transfusion between a Gallimimus and a Tyrannosaurus since there was a successful blood transfusion between a hawk and a pigeon.

Brain go BRRRRRRRRRRR

I actually like the the no spicy dinosaurs. I would’ve loved to inherit those genes because i for one can NOT tolerate spice.

The… the second one……….

What the fuck Hesploro.

#TRANSFUSION?????#that’s so weird tho science is weird but also… weirdly interesting #HESPLOROOO!!!#asks #answered

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lenorefriel · 2 years

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The Ultimate Carnivore

Tyrannosaurus lives up to its reputation as one of the most fearsome animals of all time. Its powerful jaws had 60 teeth, each one up to 20cm (8 inches) long and its bite was around 3 times as powerful than that of a lion.

Hunter or scavenger?

The Tyrannosaurus skull was over 1.5m (5 feet) long and the cavity that housed the part of the brain responsible for smell was relatively large.

Tyrannosaurus would have used its good sense of smell to hunt live prey and locate dead bodies to scavenge. It would have been able to scare off any other scavengers, so it didn't have to share. Lone or pack hunter?

Some Tyrannosaurus fossils show bite marks from other tyrannosaurs, so it's clear that they fought each other, whether over food or mates.

We know that close relatives of Tyrannosaurus sometimes lived together because there are fossils of groups who were buried together, but we don't know for sure if they hunted alone, or in packs like lions and wolves do today. So far, no groups of Tyrannosaurus skeletons have been found. Taxonomic details

Taxonomy: Dinosauria, Saurischia, Theropoda, Neotheropoda, Tetanurae, Avetheropoda, Coelurosauria, Tyrannoraptora, Tyrannosauroidea, Tyrannosauridae, Tyrannosaurinae

#gaming #dinosaur

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