T.K. Sivgin
@manospondylus.bsky.social
Science-history writer, creator of the Manospondylus blog and the Har Deshur spec-evo project
@bestcryptids.bsky.social This one is real, right?
October 20, 2025 at 6:31 AM
@bestcryptids.bsky.social This one is real, right?
Reposted by T.K. Sivgin
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....
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, ...
www.tandfonline.com
August 22, 2025 at 9:47 PM
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....
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...
August 9, 2025 at 2:21 PM
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...
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.
July 12, 2025 at 4:05 PM
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.
A compilation of videos I did with @cmkosemen.bsky.social discussing the #SilurianHypothesis: youtu.be/6ciSxFuDXCc?...
Silurian Hypothesis MEGACOMPILATION 2 (feat. C. M. Kosemen)
YouTube video by Manospondylus
youtu.be
June 29, 2025 at 10:17 AM
A compilation of videos I did with @cmkosemen.bsky.social discussing the #SilurianHypothesis: youtu.be/6ciSxFuDXCc?...
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...
June 22, 2025 at 9:31 AM
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...
Reposted by T.K. Sivgin
@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...
June 7, 2025 at 12:54 PM
@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...
Pointilisaurus, a bipedal bolosaurid parareptile that evolved on the island of Ryl Madol: rylmadolisland.blogspot.com/2025/05/poin...
#speculativeevolution #parareptile #lostworld
#speculativeevolution #parareptile #lostworld
May 30, 2025 at 2:12 PM
Pointilisaurus, a bipedal bolosaurid parareptile that evolved on the island of Ryl Madol: rylmadolisland.blogspot.com/2025/05/poin...
#speculativeevolution #parareptile #lostworld
#speculativeevolution #parareptile #lostworld
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
May 11, 2025 at 12:45 PM
Carrion trilobites, #speculativeevolution detrivores inhabiting the lost world of Ryl Madol: rylmadolisland.blogspot.com/2025/04/carr...
April 29, 2025 at 11:22 PM
Carrion trilobites, #speculativeevolution detrivores inhabiting the lost world of Ryl Madol: rylmadolisland.blogspot.com/2025/04/carr...
Plesiadapis, a Paleocene proto-primate I drew for a story. The interesting thing about this animal was that it looked more like a squirrel than a monkey and even had enlarged incisors and a diastema like a rodent.
#paleoart
#paleoart
April 20, 2025 at 7:20 PM
Plesiadapis, a Paleocene proto-primate I drew for a story. The interesting thing about this animal was that it looked more like a squirrel than a monkey and even had enlarged incisors and a diastema like a rodent.
#paleoart
#paleoart
My contribution to this current craze around the supposedly resurrected #direwolves, which I wrote because I was concerned not just about the misinformation being spread but also the ethics involved: www.manospondylus.com/2025/04/a-co...
A Colossal Mistake? De-extincting the dire wolf and the forgotten lessons of the Heck cattle
I am sure you have heard the news. In broad letters on its title page, Time Magazine presented an article in which they proudly declared tha...
www.manospondylus.com
April 8, 2025 at 6:50 PM
My contribution to this current craze around the supposedly resurrected #direwolves, which I wrote because I was concerned not just about the misinformation being spread but also the ethics involved: www.manospondylus.com/2025/04/a-co...
My latest drawing for my #speculativeevolution project Har Deshur: Floating forests in the atmosphere of a slightly more habitable #Venus!
hardeshur.blogspot.com/2025/03/floa...
hardeshur.blogspot.com/2025/03/floa...
April 5, 2025 at 11:06 PM
My latest drawing for my #speculativeevolution project Har Deshur: Floating forests in the atmosphere of a slightly more habitable #Venus!
hardeshur.blogspot.com/2025/03/floa...
hardeshur.blogspot.com/2025/03/floa...
Reposted by T.K. Sivgin
Podcast Episode 39 is here!
Once more please for the Grand Signeur, John Sibbick! We will discuss WHEN DINOSAURS RULED THE EARTH!!! And interview T. K. Sivgin!!!!!!! It's very exciting.
Once more please for the Grand Signeur, John Sibbick! We will discuss WHEN DINOSAURS RULED THE EARTH!!! And interview T. K. Sivgin!!!!!!! It's very exciting.
Podcast Show Notes: Episode 39 – Sibbick and Sivgin
Just in time to make sure it’s not an April Fools joke comes episode 39 of the world-famous Chasmosaurs podcast! It’s time once again to talk about that Grand Signeur of palaeoart, his …
chasmosaurs.com
April 4, 2025 at 8:12 PM
Podcast Episode 39 is here!
Once more please for the Grand Signeur, John Sibbick! We will discuss WHEN DINOSAURS RULED THE EARTH!!! And interview T. K. Sivgin!!!!!!! It's very exciting.
Once more please for the Grand Signeur, John Sibbick! We will discuss WHEN DINOSAURS RULED THE EARTH!!! And interview T. K. Sivgin!!!!!!! It's very exciting.
Reposted by T.K. Sivgin
Finally everything is ready to reveal my project for this year: Ive decided to open a blog to continue talking about crocodilians and their extinct relatives. All my illustrations and knowledge on the subject will be uploaded there.
Link in the first comment⬇️
Link in the first comment⬇️
March 20, 2025 at 10:12 PM
Finally everything is ready to reveal my project for this year: Ive decided to open a blog to continue talking about crocodilians and their extinct relatives. All my illustrations and knowledge on the subject will be uploaded there.
Link in the first comment⬇️
Link in the first comment⬇️
Reposted by T.K. Sivgin
Check out these feather buds on the chicken embryo's wing! Our latest study @plosbiology.org reveals that temporary inhibition of sonic hedgehog signalling transforms feathers into simple, protofeather-like structures—similar to those of their dinosaur ancestors🔬🦖🧪
journals.plos.org/plosbiology/...
journals.plos.org/plosbiology/...
March 21, 2025 at 10:06 AM
Check out these feather buds on the chicken embryo's wing! Our latest study @plosbiology.org reveals that temporary inhibition of sonic hedgehog signalling transforms feathers into simple, protofeather-like structures—similar to those of their dinosaur ancestors🔬🦖🧪
journals.plos.org/plosbiology/...
journals.plos.org/plosbiology/...
Reposted by T.K. Sivgin
This is a big one, lots to think about!
March 21, 2025 at 5:09 PM
This is a big one, lots to think about!
Classic Paleoart but with Donkey Kong Country 3 music
YouTube video by Manospondylus
youtu.be
March 18, 2025 at 9:59 AM