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?
August 9, 2025 at 2:29 PM
August 9, 2025 at 2:28 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...
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.
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...
When she’s on land she’s also wearing slippers (husband pictured on the left)
June 21, 2025 at 3:34 PM
When she’s on land she’s also wearing slippers (husband pictured on the left)
Reminds me of the cartoon plesiosaur woman I drew once
June 21, 2025 at 12:42 PM
Reminds me of the cartoon plesiosaur woman I drew once
Found the comment again: www.manospondylus.com/2020/12/anti...
June 7, 2025 at 2:09 PM
Found the comment again: www.manospondylus.com/2020/12/anti...
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 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...
The same book also features this more famous speculative reconstruction of a “pro-avis“, a hypothetical evolutionary stage of birds even older than Archaeopteryx.
#ornithology
#ornithology
January 22, 2025 at 1:31 PM
The same book also features this more famous speculative reconstruction of a “pro-avis“, a hypothetical evolutionary stage of birds even older than Archaeopteryx.
#ornithology
#ornithology
Surprisingly modern-looking #Archaeopteryx from William Plane Pycraft‘s A History of Birds from 1910.
#paleoart #birds #dinosaurs
#paleoart #birds #dinosaurs
January 22, 2025 at 1:29 PM
Surprisingly modern-looking #Archaeopteryx from William Plane Pycraft‘s A History of Birds from 1910.
#paleoart #birds #dinosaurs
#paleoart #birds #dinosaurs
The CMTK Talk Hour, my #podcast with @cmkosemen.bsky.social finally continues: youtu.be/OdQgjVmLnB0?...
January 19, 2025 at 10:44 AM
The CMTK Talk Hour, my #podcast with @cmkosemen.bsky.social finally continues: youtu.be/OdQgjVmLnB0?...
January 4, 2025 at 9:14 AM