marginocephalian

3

I’ve seen this chart floating around on my dash, and it occurred to me that I never posted the original version. So here is my and Jon‘s Dinosaur Classification Chart, in a hopefully Tumblr-palatable format.

Click here to see the moderately large version at DA.

This is a much simpler examination of dinosaur relationships than most of my watchers would probably find useful. Most of you will know that theropods are broken up into tetanurans and ceratosaurs, and that birds are nested within coelurosaurs, and that there are many internal divisions within sauropods and ornithiscians as well. But this chart is intended to be more of a quick, concise reference for laypeople, teachers, children, or whoever might have a passing interest in dinosaurs. My hope is that anyone who wants to quickly figure out what major group any given dinosaur falls into can glance at this chart and know immediately. 

This was a collaboration between myself and Jon - I did the illustrations, and he did all of the layout and text. To see this chart in full resolution, please consider buying a poster in my Zazzle shop.

Pachycephalosaurus wyomingensis

North America, Maastrichtian Age of the Late Cretaceous Period

Two wary rivals size each other up at the end of the dinosaur era. The quills are somewhat speculative, but perhaps not outside the realm of plausibility given the presence of similar structures in other Marginocephalians and more distantly-related Ornithischians.

[Please don’t use or reproduce without permission, and thanks for viewing!]

eartharchives.org
Tiny bonehead skull uncovers the early life of Pachycephalosaurus
Just like every other organism on earth, Pachycephalosaurus started out tiny. And just like most other dinosaurs known to the general public, it is associated with the adult specimens of the animal. It doesn’t help that remains of Pachycephalosaurus and its relatives are often fragmentary, complicating efforts to identify and classify the dinosaurs.

The smallest dinosaur of its kind found to date, the fragments support the idea that its head ornamentation changed as it grew up.

Image credit: @paleoart

By ~francisPapillon:

This is my entry for conceptart.org ’s cow n. 121 Arctic Dinosaur

I named it Nivaceratops Ansonni. My concept was to take a kind of ceratopsian that would have survived the extinction and make it evolve to the point that it becomes an arctic creature. It’s behavior is similar to that of a musk ox. 

I didn’t colour it since i wanted to focus on the texture. 

The basic ceratopsian skeleton I used is one from Luis V. Rey.

eomao  asked:

Hello dracontes! I've come to you before with questions about dinosaur biology, and I'm hoping you'd be willing to point me in the right direction again. In my webcomic I'm coming to a point where pachycephalosaurus play a significant part, and I'm not sure how accurate the "traditional" depiction is. I've heard ceratopsians may have had quills, is it possible pachys would have had a similar feature? Are there any other outstanding theories making the rounds? Thank you for your consideration!

First my profound apologies for not answering any sooner, if it is indeed the case that your question was asked a while ago (I see no date on the messages).  All I can say is that on my connection, Tumblr is irritatingly slow on the reblogging, and I’ve recently been fairly preoccupied otherwise.

On to your questions…

Considering both Tianyulong and Kulindadromeus along with Psittacosaurus you’re pretty much free to devise whatever intermediate filamentous integument distribution pattern you like. The implied method, should you be unaware, is phylogenetic bracketing. True enough, it is rather unlikely that the dome and associated spines had any covering other than keratinous plates.

I do hope this isn’t too concise to be intelligible. Do follow up if you have more questions. I’ll be sure to catch up with your comic in the meanwhile. Keep up the great work :-)

Stenopelix valdensis

By Jack Wood on @thewoodparable

PLEASE support us on Patreon! We really do need all of your support to keep this blog running - any amount helps!

Name: Stenopelix valdensis

Name Meaning: Narrow Pelvis

First Described: 1857

Described By: Meyer

Classification: Dinosauria, Ornithischia, Genasauria, Neornithischia, Cerapoda, Marginocephalia, Ceratopsia

Stenopelix is an enigmatic dinosaur from the Wealden Formation in Germany, dating back to about 127 million years ago, in the Barremian age of the Early Cretaceous. It is known from a partial skeleton that completely lacks the skull, which is where the problems surrounding this little dinosaur lie. It has been thought to be an Ornithopod, a Ceratopsian, a Pachycephalosaur, and an indeterminant Marginocephalian. Though it has been recovered as the sister taxon of Yinlong, this is still up in the air; for now, it’s best to say that the jury is still out, and will be until better remains of this animal are found. 

Source:

https://en.wikipedia.org/wiki/Stenopelix

Shout out goes to @itstimeversusyouandme!

10

Carnegie Museum - Part 3

The first thing to greet one’s arrival to the Cretaceous hall is one of the famous quilled specimens of Psittacosaurus. Across the way are some other Jehol Biota animals, complete with models (like this Sinornithosaurus). They look fairly well, so far as museum models of feathered dinosaurs go—that is to say, they don’t look quite like naked dinosaurs with feathers just glued on. Beside the models are a couple specimens, including this Caudipteryx with feathers and its last meal, preserved in its stomach.

A step ahead is Protoceratops, doing what it does best, whatever that may be, and across from that, Corythosaurus. Just ahead are the heavy-hitters of the Cretaceous exhibit, a pair of Tyrannosaurus rex feuding over a corpse. It’s that of Edmontosaurus, being snarled over by tyrannosaurs because this is all edmontosaurs ever did.

Just around the corner is a rare site in most dinosaur halls, a mounted Pachycephalosaurus at full charge. Next to him are a rogue’s gallery of his marginocephalian buddies, the ceratopsians. From the left clockwise, they're Pachyrhinosaurus, Zuniceratops, Diabloceratops, and Torosaurus. Their more famous cousin, Triceratops, stands a bit further down.

Last on the way out of the dinosaur hall is the recently-named caenagnathid Anzu wileyi. The fossil was discovered 15 years ago, and the holotype at this point was presumably sitting just under my feet. Spooky.

Past here, some Cenozoic skeletons and another photoset.

Hell Creek, 65 million years ago, two months after the K-T took place. Our fellow Quetzalcoatlus’ migration was abruptly interrupted by a rock that came from outer space, visible as a small shooting star while he was flying among the birds.

After the meteor crashed, Earth’s ecosystems started to collapse. In Hell Creek, apart from the immediate deaths caused by the impact, the consecutive catastrophes wiped all most plant life. The fern prairies were the first to go, and with them the big hadrosaur herds that fed on them. Big predators perished right after a brief moment of abundance, when there were no more carcasses to sustain them. After the course of two months, only the most adaptable animals were still standing, though some of them would not live enough to see the light of day shining again through the ash clouds.

In this scenario, Ol’ Quetz tries to make a meal out of a hadrosaur carcass that is almost picked clean, but before he can even feel the taste of bone, a pair of Triceratops, with no more harem to protect nor plants to browse on, spot this last piece of hope. They are perfectly used to this kind of high-protein nutrition but in this case, is a matter or urgency. And they won’t let the pterosaur enjoy it without a fight.

A lone Pachyrhinosaurus, wandering away from the migrating herd, stops grazing to witness the first rays of sunlight after months of darkness, announcing the arrival of spring. The day will last only for a moment, but it means change for all alaskan creatures.

The mammals know it’s time to leave their burrows. The hadrosaurs are coming back with their honking calls. While the little trodoontids and dromeosaurids are starting to build their nests, and the arctic tyrannosaurs are shedding their white coats to match the melting snow, the ankylosaurs are waking up from their hybernation.

For the Pachyrhinosaurs, it’s time for some head butting.