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T.K. Sivgin

@manospondylus.bsky.social
146 followers 139 following 235 posts

Science-history writer, creator of the Manospondylus blog and the Har Deshur spec-evo project

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Reposted by T.K. Sivgin
Mario Lanzas @mariolanzas.bsky.social · 15h
PACHYDESMOCERAS, from the ✨super fresh✨ video: www.youtube.com/watch?v=tEQ0... on Ammonites and other Cephalopods 🦑 Pachydesmoceras had a wide range of sizes, measuring from a few cms to human size 🍥 Fossils have been found worldwide, especially in Japan #pachydesmoceras #ammonite #paleoart
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Yay, Sound of Joy > AnthroSocal🏳️‍🌈🏳️‍🌈 @yeaunganimation.bsky.social · 03/10/2026
Colored an old Wil E coyote walk cycle.
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Thomas R. Holtz, Jr. @arctomet.bsky.social · 28/09/2026
Bi, S., Shi, Y., Li, Z. et al. A polyphyodont, semiaquatic eutriconodontan mammal from the Early Cretaceous of China. Nat Commun 17, 10032 (2026). doi.org/10.1038/s414...
doi.org
A polyphyodont, semiaquatic eutriconodontan mammal from the Early Cretaceous of China - Nature Communications
Most mammals replace their teeth only once. A new, carnivorous, semiaquatic fossil mammal from the Early Cretaceous of China reveals multiple tooth generations, enhancing our understanding of mammal d...
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Sophie M. @sophiesaurus98.bsky.social · 28/09/2026
Today's four random pieces of palaeoart: Luis Rey's Pterodactylus, @kakapojay.bsky.social's Lisowicia, Tuomas Koivurinne's Mojoceratops, and Benjamin Waterhouse Hawkins' Megatherium!
A black and white Pterodactylus stands atop a rocky hill overlooking the calm sea. Its swooping, fiery-coloured crest is marked by black streaks and spots which extend onto the toothy jaws. It grips a little squid by its feeding arms between its protruding teeth.Two heavily built, big-headed dicynodonts stand astride each other in a forest. Their earth-toned, leathery hides contrast with the lush greenery of the surrounding trees.The carcass of a green ceratopsian lies in a stiff-limbed posture in a dry riverbed, surrounded by the skeletal remains of other horned dinosaurs. Two crow-like birds alight atop the body.A pair of enormous, short trunked ground sloths under the leaves of a tree with a thin, curving trunk. One stands bipedally, clutching the trunk with its huge claws, while the other sits in a comically low quadrupedal pose, its head appearing behind the shoulders of its companion.
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The Onion @theonion.com · 27/09/2026
Xi Jinping Impressed With How Much Trump’s English Has Improved Since Last Visit
theonion.com
Xi Jinping Impressed With How Much Trump’s English Has Improved Since Last Visit
WASHINGTON—Marveling at how his American counterpart’s grasp of the difficult language had progressed, Chinese leader Xi Jinping told reporters Thursday that he was deeply impressed with how much Pres...
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Acyn @acyn.bsky.social · 24/09/2026
Room empties out at the UN as Netanyahu begins his speech.
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Sarah McAnulty, Ph.D. @sarahmackattack.bsky.social · 24/09/2026
If you want a full rundown of the Academy of Natural sciences situation, this video does a really good job of covering it. youtu.be/nxyfBfCrbDw?...
youtu.be
The Plan To Destroy Americas Oldest Natural History Museum
YouTube video by Miniminuteman
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Thomas R. Holtz, Jr. @arctomet.bsky.social · 24/09/2026
A new sabre-toothed thylacosmilid (Thylacosmilidae, Metatheria) from the Pliocene–Pleistocene of Southern Buenos Aires Province, Argentina: Alcheringa: An Australasian Journal of Palaeontology: Vol 0, No 0 - Get Access www.tandfonline.com/doi/full/10....
tandfonline.com
A new sabre-toothed thylacosmilid (Thylacosmilidae, Metatheria) from the Pliocene–Pleistocene of Southern Buenos Aires Province, Argentina
Thylacosmilids are a clade of metatherian predators known from lower Miocene to upper Pliocene strata of South America. They had highly specialized skulls with enlarged canines. Here, we describe r...
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Anthony (Tony) J. Martin @ichnologist.bsky.social · 23/09/2026
Same. Began a chapter in my book 'The Evolution Underground' (2017, @pegasus-books.bsky.social) with a story about a Lystrosaurus & her journey from the safety of her burrow into the vast wastelands of the Early Triassic. Also co-created this folk-art-style depiction emerging post-extinction.
Colorful folk-art depiction of a Lystrosaurus underground in the bottom of its burrow, and with another leaving the burrow at its top. emerging into sunshine, blue sky, clouds, and green plants.
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depths of wikipedia @depthsofwikipedia.bsky.social · 23/09/2026
when i mention "claude" you can assume i'm talking about the albino alligator not the llm
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Sophie M. @sophiesaurus98.bsky.social · 23/09/2026
Sauropods: An Artistic History in Four Parts (Art by Charles Knight, Bill Berry, John Gurche, and @tessasaurus.bsky.social)
A group of wriggly-necked, blunt-skulled Brontosaurus wade in a lake while one emerges on the shore, dragging its lengthy tail behind it. A Stegosaurus approaches the lake, dwarfed by the long-necked herbivores.A towering Brachiosaurus with a drooping tail hauls itself out of the water, moving in a wide-legged waddle as rivulets of water drip down its hide. An impossibly tall, earthy-brown Barosaurus with elephantine skin rears high in the air, threatening to crush an encroaching Allosaurus. A young Barosaurus hides behind its tree-trunk legs, crouching in fearful trepidation. A dense conifer forest and gorgeous cloudscape extend behind.A low view of a colossal rearing titanosaur. Its heaving bulk produces a cloud of dusty sand as it lifts upward, revealing the complex array of scales covering its underside and limbs. A little feathered theropod looks on, looking comically tiny beneath the great mass of the colossus before it.
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The Onion @theonion.com · 21/09/2026
NSFW Artist Struggling To Improve On Sexiness Of Regular Muppets theonion.com/nsfw-artist-struggling…
NSFW Artist Struggling To Improve On Sexiness Of Regular Muppets
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T.K. Sivgin @manospondylus.bsky.social · 21/09/2026
After 6 years David Peters has finally found the post where I mention his whackjobisms and the results are as you‘d expect them to be: www.manospondylus.com/2020/01/the-...
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PaleoJim @paleojim.bsky.social · 15/09/2026
Love this discovery adding to strong dinosaurian ties between North America and Europe during the latest Jurassic. Certainly, the J/K boundary story is a shared Euramerican story. phys.org/news/2026-09... @utahpaleo-ufop.bsky.social @societyofvertpaleo.bsky.social @paleontologizing.bsky.social
phys.org
First confirmed Diplodocus outside North America reshapes Late Jurassic migration picture
In a discovery that challenges our understanding of dinosaur distribution during the Late Jurassic period, paleontologists have identified the first evidence of the iconic Diplodocus outside North Ame...
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SaurianCYH @sauriancyh.bsky.social · 09/09/2026
21st century retrosaurs 1. Dreadnoughtus schrani
A Dreadnoughtus with sprawling pegs and extremely thin neck crawling into a lake, where other Dreadnoughtus are having sex in the water. A volcano busts out smoke in the background.
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Thomas R. Holtz, Jr. @arctomet.bsky.social · 10/09/2026
Bird feathers from a Late Cretaceous coprolite: Current Biology www.cell.com/current-biol...
cell.com
Bird feathers from a Late Cretaceous coprolite
O’Connor et al. describe a Cretaceous coprolite preserving feathers. Bone fragments suggest they are from a hesperornithiform bird, consistent with feather morphologies associated with reduced water p...
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Thomas R. Holtz, Jr. @arctomet.bsky.social · 10/09/2026
xkcd.com/3296/
xkcd.com
Fault Taunting
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Anonymous @youranoncentral.bsky.social · 10/09/2026
Never forget
Two strong fireman pull Donald Trump from rubble on 9/11
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Cold Crash Pictures @coldcrashpics.bsky.social · 08/09/2026
Aaaand it's up! Allow me to introduce you to the world's very first dinosaur film—now available to the public for the first time!
youtu.be
Saurian Cinema: Introducing the World's First Dinosaur Film
YouTube video by coldcrashpictures
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Darren Naish @tetzoo.bsky.social · 06/09/2026
Now 40 comments at the Tetrapod Zoology #unicorn article: it's proved quite popular. Still planning to cover the whole "no, dragons are not linked to dinosaurs" issue at some point. tetzoo.com/blog/2026/8/... #monsters #cryptozoology
tetzoo.com
A History of Unicorns — Tetrapod Zoology
unicorn, unicorns, monoceros, monokeros, unicorn history, mythology, unicorn mythology, unicorn in the Islamic world, unicorn in Christian history, unicorn in the Book of Job, unicorn in the Bible, un...
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TheAbbeyRoadie | Commissions Open! @theabbeyroadie.bsky.social · 06/09/2026
The brainrot on the dead bird app is a LOT, guys…
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Sarah Andersen @sarahseeandersen.bsky.social · 05/09/2026
The image is of a four panel comic.
In the first panel we see a dragon sitting on a pile of treasure. A speech bubble pointing off panel reads, “Dragon, why do you have all this treasure?”
In the second panel we zoom in on the dragons face. He simply says “shiny”.
In the third panel we pan to the left and see that there is a crow standing next to the dragon on the treasure.
In the fourth panel we zoom in on the crows face. He says “hell yeah”.
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romulus - 🛸METROID RAVENOUS🍽️ @romulusofficial.bsky.social · 06/09/2026
it must be so difficult to act with a character who you can’t even see. thankfully, Foghorn is just that talented
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T.K. Sivgin @manospondylus.bsky.social · 04/07/2026
Fun fact: Most paleoart of Dickinsonia is probably very wrong. Fossils show that the characteristic isomeric structure seen in most fossils was actually an internal organ that in life was covered by tubercled skin. Only the underside of the organism would have actually had the isomers visible
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beetle moses @beetlemoses.bsky.social · 17/03/2026
Three panel comic. Panel 1: young man in a hoodie looking morose and sitting on a swing set. He says “she’s breaking up with me…” Panel 2: next to him is a glyptodon, an early ancestor of armadillos. With his head in his hands, the young man says “what do I do glyptodon?” Panel 3: the glyptodon says “I’m like an early ancestor of armadillos. The young man angrily replies, “are you even listening man?”
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T.K. Sivgin @manospondylus.bsky.social · 12/03/2026
Was just reading the Wikipedia page on Anterograde Amnesia and it‘s funny how all the listed fictional examples are hardcore psychological thrillers and Dory from Finding Nemo.
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Sophie M. @sophiesaurus98.bsky.social · 11/03/2026
I don’t think I love anything as much as the surreal, alien palaeoart of the 70s into the early 90s. These compositions are all naturalistic, but they’re strange and hypernatural in a way that transcends realism. It’s a bizarre but profoundly moving approach to reconstructing the past.
A quilled Velociraptor with tightly folded arms stands atop a pile of loose stones, backed by an intensive purple and orange sunset.A leathery-winged, white-furred Dimorphodon with red legs soars above rough waves. In the distance, jutting stones pierce a sulphurous sky. A red-headed Albertosaurus moves alongside a herd of Lambeosaurus, splashing through a shallow woodland stream. The sky is a smoky blue with wisps of clouds strewn about. The massive form of a colossal asteroid hovers menacingly above it all.An emaciated Triceratops with ragged skin sits in a low squat, shown in stark white against an almost entirely black composition. A cutaway view shows a tangle of roots piercing deep into the ground, a visual representation of the sickness penetrating the dinosaurs body.
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Thomas R. Holtz, Jr. @arctomet.bsky.social · 02/03/2026
Larcombe, A.N., Bierwirth, P.N. Carbon dioxide overload, detected in human blood, suggests a potentially toxic atmosphere within 50 years. Air Qual Atmos Health 19, 44 (2026). doi.org/10.1007/s118...
doi.org
Carbon dioxide overload, detected in human blood, suggests a potentially toxic atmosphere within 50 years - Air Quality, Atmosphere & Health
Air Quality, Atmosphere & Health - Anthropogenic activities are increasing the amount of carbon dioxide (CO2) in the atmosphere. There is mounting experimental evidence that lifetime exposure...
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T.K. Sivgin @manospondylus.bsky.social · 07/02/2026
Something I made for fun: youtu.be/5o6IsNMXxgU?...
youtu.be
Darwin IV but with Oddworld music
YouTube video by Manospondylus
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The Onion @theonion.com · 31/01/2026
"It’s really a shame that I learned all of this too late."
theonion.com
Man Who Lost Everything In Crypto Just Wishes Several Thousand More People Had Warned Him
CHICAGO—Saying he had been absolutely blindsided by the sudden change in his fortunes, local 33-year-old Tyler Branton, a man who lost everything in cryptocurrencies, told reporters Thursday that he j...
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T.K. Sivgin @manospondylus.bsky.social · 31/01/2026
In other news, I built and set-up my own aquarium!
A cubical aquarium with a little pineapple decoration suitable for a sea sponge.
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T.K. Sivgin @manospondylus.bsky.social · 28/12/2025
Eusmilus, the Oligocene sabretoothed “false“ cat, drawn by Me #paleoart
A sabretoothed carnivorous mammal with round ears and a long tail, drawn in stippling style
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Natalia (娜塔莉) @wrycritic.bsky.social · 24/12/2025
Merry Christmas 🎄✨
Christmas cards, created by the de la Rue Company for the Natural Museum of London, 1875-1885. Ideal impression of a future creation discovered by Professors Ichthyosaurus, Megalosaurus, & Co“A rink in the Glacial Period.”“Study of the Mammoth and Dinotherium”
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Darren Naish @tetzoo.bsky.social · 23/12/2025
Pseudoarchaeology is a grift and a scam, stuffed full of conspiracy bs. Check out this new video at Professor Dave Explains ... Jimmy Corsetti is Human Garbage www.youtube.com/watch?v=Z49A...
youtube.com
Jimmy Corsetti is Human Garbage
YouTube video by Professor Dave Explains
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T.K. Sivgin @manospondylus.bsky.social · 04/12/2025
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T.K. Sivgin @manospondylus.bsky.social · 02/11/2025
youtu.be/Bn_kXKlSX5o?...
youtu.be
Nanotyrannus did it
YouTube video by Manospondylus
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T.K. Sivgin @manospondylus.bsky.social · 20/10/2025
@bestcryptids.bsky.social This one is real, right?
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Entomemeology @entomemeology.bsky.social · 31/08/2025
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T.K. Sivgin @manospondylus.bsky.social · 22/08/2025
So there is this new paper which shows that unenlagiids were actually secondarily flightless #avialans. Which is cool and all, though what confuses me is that Greg Paul isn’t cited anywhere in it, despite him being the first and strongest supporter of this idea: www.tandfonline.com/doi/full/10....
tandfonline.com
Phylogenetic relationships of Unenlagiidae among Paraves (Dinosauria)
In recent years, several studies on the osteology, myology and palaeobiology of southern paravians of the clade Unenlagiidae have considerably increased the information on the group. Nevertheless, ...
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T.K. Sivgin @manospondylus.bsky.social · 09/08/2025
Martin Wilfarth was a German researcher who in the 1940s claimed that Mesozoic Earth was experiencing super tides and that all dinosaurs were actually semi-marine animals. In a 3-part series I try to explore the how and why of his reasoning: www.manospondylus.com/2025/08/wilf...
The armored dinosaur Kentrosaurus, reconstructed as a shallow-water-dweller, using its thagomizer to anchor itself in the sand as it stands up to breatheIguanodon, reconstructed as an aquatic animalCorythosaurus, reconstructed with a fleshy breathing-proboscis extending from its headcrestDiplodocus, reconstructed as an ocean-bottom dweller “grazing” on marine worms
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T.K. Sivgin @manospondylus.bsky.social · 25/07/2025
All the #fossils I collected in Donkey Kong Bananza
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T.K. Sivgin @manospondylus.bsky.social · 12/07/2025
A teaser for a blogpost I am working on. Between the 1930s and 50s, German paleontologist Martin Wilfarth proposed that the headcrests on #hadrosaurs were actually attachment-points for snorkel-trunks. This was part of his wider ides that all #dinosaurs were tidal animals.
Speculative reconstruction of the dinosaur Corythosaurus with a fleshy trunk extending from its bony headcrest, used as a snorkel while the animal is submerged in water.
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T.K. Sivgin @manospondylus.bsky.social · 29/06/2025
A compilation of videos I did with @cmkosemen.bsky.social discussing the #SilurianHypothesis: youtu.be/6ciSxFuDXCc?...
youtu.be
Silurian Hypothesis MEGACOMPILATION 2 (feat. C. M. Kosemen)
YouTube video by Manospondylus
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T.K. Sivgin @manospondylus.bsky.social · 22/06/2025
While you don‘t often see it in paleoart, there is decent biomechanical evidence that #glyptodonts were actually quite good at bipedalism. Here‘s a cute illustration from: onlinelibrary.wiley.com/doi/abs/10.1...
Illustration of a giant armadillo bending its tail to the side to walk upright on two legs
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T.K. Sivgin @manospondylus.bsky.social · 12/06/2025
youtu.be/N0TCXashVg4?...
youtu.be
Paleoart but with Donkey Kong Country Tropical Freeze Music
YouTube video by Manospondylus
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Darren Naish @tetzoo.bsky.social · 07/06/2025
@davehone.bsky.social stars in a new YouTube video, so guess who turns up in the comments section? Yup, chronically-online, 365-day blogger David Peters. That's my personal bat-signal, so...
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T.K. Sivgin @manospondylus.bsky.social · 30/05/2025
Pointilisaurus, a bipedal bolosaurid parareptile that evolved on the island of Ryl Madol: rylmadolisland.blogspot.com/2025/05/poin... #speculativeevolution #parareptile #lostworld
A small, bipedal parareptile, drawn in pointilist style
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T.K. Sivgin @manospondylus.bsky.social · 11/05/2025
Gastornis, looking out into a changing Eocene world that is becoming increasingly less tropical. These birds were mainly forest dwellers, eating hard fruits and nuts, and likely went extinct due to habitat loss from climate change. I drew this for a story I‘m writing on my Patreon. #paleoart #birds
Gastornis, a man-sized flightless bird stands at the forest‘s edge and looks out into the barren volcanic plains of inner North America
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T.K. Sivgin @manospondylus.bsky.social · 30/04/2025
Carrion trilobites, #speculativeevolution detrivores inhabiting the lost world of Ryl Madol: rylmadolisland.blogspot.com/2025/04/carr...
The skull of a synapsid proto-mammal with a headcrest is swarmed by three trilobites gnawing the last bits of flesh off its bones
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