pseudosuchian

Chindesaurus bryansmalli was an early dinosaur, probably a basal theropod close to Herrerasaurus. It lived during the Late Triassic (Carnian-Norian) period in what is now the Southwestern United States. It was a small, bipedal carnivore with a long tail and a length estimated at 2 to 2,3 meters (6.6 to 7.5 feet).

The Upper Petrified Forest National Park in the Chinle Formation in southwestern U.S.A was an ancient floodplain rich in lungfish and clams. Phytosaurs, rauisuchids, archosaurs, pseudosuchians and other tetrapods lived and competed alongside dinosaurs like Chindesaurus.

My restoration of Chindesaurus include proto-feathers, a likely feature in basal dinosaurs.

anonymous asked:

Since people use ectothermy to define reptiles, then I guess ichthyosaurs, plesiosaurs, actual lizard mosasaurs, turtles, pterosaurs, and pseudosuchians weren't reptiles either. Crocodiles, what, evolved back into reptiles? And this isn't even getting into erect limbs, lack of scales, or live birth.

Yeah, feature-based clades are Problematic™ for this reason.

anonymous asked:

You know dinosaurs ain't real right?

I turn dramatically to the entirety of birds present on this planet. They all stare at me, expectantly, their little birdie faces looking at me in various expressions and emotions. After all, birds are not one unified group. 

“I’m sorry guys,” I whisper, my voice hoarse and pained. 

One African Grey caws out, “Why are you sorry, Meig?”

I take a long, slow breath, “Tumblr Anon says you’re not real.” 

Thousands of voices caw out in unison. The horror in the air is palpable. A Harpy Eagle screeches in fury, while a Little Blue Penguin waddles up to me at the front of the room. 

“What do we do?” the penguin asks, even though penguins can’t talk, because I mean, does it matter, since penguins apparently don’t exist? 

“We move on, my friend,” I say, patting the penguin on the head, “We move on.” 

Slowly but steadily, the birds fly or walk away, all moving out in unison. Some go to universes where they do exist. Others stay here, as ghosts - remnants of an idea that once was. 

I change the title of ADAD to A Pseudosuchian A Day. I begin talking about scutes instead of feathers. 

But finally, the lies we have all been living under have been exposed. 

Retrosaurs: A Guide

This is inspired by another suggestion from @titleknown.  I’ve posted a couple things about my retrosaurs before, of course, but this one is different for a few reasons: 1. it’s more detailed, 2. it’s open source with ONE condition, namely that the designs used in this guide belong to me.  That is to say, all the written concepts here are open for anyone to use in any story they see fit, but all the monster designs in the images belong to me alone - especially the colored ones, since those guys are specific characters of mine.

All of the information here is canon for my novel-in-progress The Atomic Time of Monsters, but is also written vaguely enough so it could be used in other stories.  Once again, I must reiterate that the specific monster designs shown in these illustrations are mine - but I’m sharing the written stuff with anyone who wants it.

So if you ever wanted to use my retrosaurs in a story, or just know more about them, well, this is your guide.  More after the cut!

Keep reading

Desmatosuchus, one of that mighty lineage of armor-backed pseudosuchians, the aetosaurs (or as Darren Naish once aptly termed them, the armadillodiles). It joins its distant relatives ShuvosaurusEffigia, and Simosuchus in defying the carnivory we may come to expect from croc-line archosaurs. The shovel-like snout and peg-shaped teeth of aetosaurs would seem to pin them as herbivores.

All the same, it has been postulated before that these were instead adaptations for insectivory, and an abstract has been around since 1995 toting around the supposed discovery of a carnivorous aetosaur. Personally I wouldn’t be surprised if they were something more akin to boar-like, omnivorous scavengers of Triassic forests.

Desmatosuchus was among the larger members of the family, spanning about 5 meters (16 feet) in length. It’s known from the Late Triassic of Texas.

anonymous asked:

It bugs me that crocodiles are in a clade called "fake crocodiles"

Well back in the day all those weird croc-relatives were called Pseudosuchians because they weren’t true crocs. But then when cladistics was implemented it was found that they formed a clade with crocodiles, so they all had to be included. Ah science!

markfiend  asked:

How come crocodilians are called Pseudosuchians when (as far as my rusty classics tells me) Pseudosuchia means "false crocodiles"?

fezraptor​ has explained this to me beautifully (featuring silly comment from ryuukiba): 

[9/30/15, 16:41:11] John: Essentially, “Pseudosuchia” was originally erected for a mix of various Triassic vaguely crocodile-like species, such as aetosaurs
[9/30/15, 16:41:47] John: It was called “false crocodiles” because they superficially resembled crocodiles in many ways, but were radically different in many other ways
[9/30/15, 16:43:03] John: Over time, “Pseudosuchia” came to be a wastebasket taxon for most “thecodonts”
[9/30/15, 16:43:25] John: “thecodont” here means what we’d now call non-dinosaur, non-pterosaur, non-crocodilian archosauriforms
[9/30/15, 16:43:47] John: even Longisquama was initially assigned to Pseudosuchia!

[9/30/15, 16:44:23] Ryuu: wow… that pseudosucks….ia….

[9/30/15, 16:44:49] John: However, with the advent of cladistics and phylogenetic taxonomy, it became clear that most pseudosuchians (with…obvious exceptions…) were a paraphyletic grade of basal crocodile-line archosaurs
[9/30/15, 16:45:38] John: so, in 1986, when Gauthier devised the first phylogenetic taxonomy of archosaurs, he used Pseudosuchia to be the crocodile total group, because most “pseudosuchians” were stem-crocodiles
[9/30/15, 16:45:42] John: That name has stuck

Hopefully that’s a helpful explanation! 

10

American Museum of Natural History, Part 23: Big Chompmen

PSEUDOSUCHIA!!!! This was the Pseudosuchia corner of the Miscellaneous Vertebrate Hall. Unlike the Crocs Among Us special exhibit, it had non-Crocodylomorph Pseudosuchia (namely, the handsome chap, Prestosuchus, in images 3-6) 

I love Pseudosuchians so much. They’re such good chomps. 

Watch out for this fearsome Fossil Friday!

Although Prestosuchus chiniquensis was a large animal with big claws and a huge head with sharp-toothed jaws, it was not a dinosaur. This creature belongs to a larger group called Pseudosuchians, which also includes modern day crocodilians. 

Today, these creatures are only represented by a couple dozen species, but back in the Triassic, they were extremely diverse, and in direct competition with early dinosaurs. Late in the Triassic, multiple extinction events led to the demise of many major Pseudosuchian lineages, opening up niches for dinosaurs to take advantage of. Thus, the rest of the Mesozoic became the age of dinosaurs. Learn more about this extinction in the most recent episode of Shelf Life

This specimen is a reconstructed composite of several Prestosuchus specimens collected in Brazil and dating from the Late Triassic, about 210 million years ago.

Find this skeleton cast in the Museum’s Hall of Vertebrate Origins.

AMNH/D.Finnin

The Carolina Butcher

Last year, a new species of crocodilian relative was discovered from Late Triassic North Carolina.  Dubbed Carnufex carolinensis - “the Carolina butcher” - this animal grew up to nine feet long, and was capable of walking on its hind legs.

Carnufex is interesting for being a basal crocodylomorph - a member of the clade that includes modern crocodilians.  This proves that crocodylomorphs were vying for apex-predator positions during the Late Triassic, along with early theropods, as well as several other groups of pseudosuchians known as rauisuchids and poposauroids.  

This extreme diversity of predators proved unsustainable, and many of these animals - including Carnufex - died out by the time the Triassic period was over.  Theropod dinosaurs became the top predators for hundreds of millions of years afterward, while Carnufex’s surviving relatives were relegated to less dominant positions.