Tristan J. Stock
@archelosaurian.bsky.social
1.4K followers 220 following 110 posts
Master of Science in Paleontology working on fossil Archelosauria. Currently studying Miocene sea turtles at the Los Angeles Natural History Museum. Enjoys talking about Reptiles (including Birds!), SpecEvo, and general nerd stuff.
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archelosaurian.bsky.social
Biggest surprise for me is honestly the location. Most notosuchians and fossil giant crocs hug the equator, but this animal is from the Chorrillo Formation, which is ~52 degrees south paleolatitude. In the southern hemisphere winter, that's 17-18 hour long nights! This guy might have seen snow.
archelosaurian.bsky.social
Been a good couple of days for extinct armored Archelosaurians. Giant (~4m) terrestrial hypercarnivorous crocodyliform Kostensuchus atrox living in a high paleolatitude environment at the end of the Cretaceous. Many surprises in that sentence. Also, epic animation!
journals.plos.org/plosone/arti...
Reposted by Tristan J. Stock
richardjbutler.bsky.social
It also highlights the incredible significance of Moroccan palaeontology. A very sad part of this story is that Spicomellus fossils - very likely parts of exactly the same skeleton that we describe - are for sale having been illegally poached & smuggled. I hope these find their way back to Morocco.
Reposted by Tristan J. Stock
richardjbutler.bsky.social
Out today in Nature is the most exciting dinosaur paper I've ever been involved in - led by @tweetisaurus.bsky.social we describe a partial skeleton of the UTTERLY BIZARRE Spicomellus from the Middle Jurassic of Morocco, the oldest known ankylosaur. (1/x)

www.nature.com/articles/s41...
archelosaurian.bsky.social
What an incredible animal. It looks almost like if a toddler drew an ankylosaur and wouldn’t stop giving it spikes. Very interested in what else comes out of these beds in the future.

www.nature.com/articles/s41...
Reposted by Tristan J. Stock
tweetisaurus.bsky.social
Hi all, me, @richardjbutler.bsky.social and the amazing UK-US-Moroccan team are delighted to announce that.. we have a new specimen of Spicomellus AND IT'S WAY WEIRDER AND WAY COOLER THAN WE EVER IMAGINED!!
Reposted by Tristan J. Stock
shanrattie.bsky.social
Babe, wake up - Xanthochromic nurse shark just dropped..

Caught by some sport fishermen out near Costa Rica (and released after some photos were snapped)

Look at this beaut, how ORANGE!!
A photo of a man in a cap holding the line on which is a very bright orange Nurse Shark ( a very flat, bottom feeding shark that is no threat to humans) in this photo you can clearly see the silver/white eye of the animal. A photo of a man in a cap holding the line on which is a very bright orange Nurse Shark ( a very flat, bottom feeding shark that is no threat to humans) in this photo the angle is a lot higher, showing the entire body of the shark from above water.
Reposted by Tristan J. Stock
mosscoveredbeing.com
A basic attacking sequence for Auryn (class: Sword Priest)
Reposted by Tristan J. Stock
coreybrotherson.bsky.social
Superman has its moments of clunk and mildly distracting story quirks, but otherwise it's a damned delight. 100% what the genre needed in movies right now: sincere, fun and unashamed of its roots.

(And no, its textual message isn't confused - it just knows the complex requirements of resistance.)
A picture of Hawkgirl (played by the wonderful Isabela Merced) saying "I'm not like Superman."
Reposted by Tristan J. Stock
tetzoo.bsky.social
In recent years, palaeobiologist Tess Gallagher has presented results that challenge ideas about sauropod dinosaur skin, and which have major implications for biology and appearance. Tess is covering this in her talk at #DinoConUK, Aug 16th-17th, Exeter! Go to dinocon.co.uk for tickets and info.
Gallagher image showing sauropod with detailed positional info on skin anatomy. John Conway art showing Diplodocus with elaborate skin anatomy. DinoCon promo image showing Tess Gallagher in the field... with puppet friend.
archelosaurian.bsky.social
These structures are also associated with a big vertebral “hump.” Most drepanosauromorphs also have this “hump,” so it could be an osteological correlate for the whole clade.

This plus some unpublished stuff certainly hasn’t helped Drepanosauromorphs beat those “weirdest tetrapod” allegations.
Triassic diapsid shows early diversification of skin appendages in reptiles - Nature
A Middle Triassic diapsid is presented that has a distinctive crest consisting of integumentary appendages that are structurally distinct from avemetatarsalian feathers.
www.nature.com
Reposted by Tristan J. Stock
jhemiptera.bsky.social
Shri rapax and Halszkaraptor
Reposted by Tristan J. Stock
mostlymammoths.bsky.social
Smithsonian-Led Team Discovers North America's Oldest Known #Pterosaur

www.si.edu/newsdesk/rel...

(Art: Brian Engh)
Caption in release: "An artist’s reconstruction of the fossilized landscape, plants and animals found preserved in a remote bonebed in Petrified Forest National Park in Arizona."

A small pterosaur has a fish in its beak while yellow frogs scramble away from it at the water's edge.  Lots of footprints are in the mud/sand beside the water, and there are more pterosaurs flying in the air.  An upended skull is in the background, as is something that looks like a turtle-relative.
Reposted by Tristan J. Stock
renegadecut.bsky.social
There has never been a sequel to Jurassic Park, but every few years, a bunch of pranksters pretend that one is coming and also that it's pretty good and worth seeing. Everyone keeps falling for it, too.
Reposted by Tristan J. Stock
snowwolpard.com
russian tortoise 🐢
A cutesy illustration of a brown Russian tortoise.
Reposted by Tristan J. Stock
clarkeocrinus.bsky.social
We had a snapper and painted turtle laying eggs this evening.
Reposted by Tristan J. Stock
extinctmonsters.bsky.social
Some good news: a mama snapping turtle has blessed the Dinosaur Park spoil pile with her eggs
Pile of grey dirt with a turtle on it. Red ironstone rocks in front. Photo from JP Hodnett Snapping turtle digging in grey lignite and clay. Photo by JP Hodnett