Jack Stack
@jackstack.bsky.social
Trophy husband, PhD vertebrate paleontologist. 0 time rank 1 wow PVP player. I also write about the history of fishes: https://fishhistory.substack.com/. He/him
Me watching The Meg as a fish scientist.
November 10, 2025 at 10:35 PM
Me watching The Meg as a fish scientist.
Reposted by Jack Stack
The Fudge Lab at Chapman University is recruiting a postdoc for an NSF-funded project on the biophysics of hagfish defensive slime deployment. Please repost!
Apply here: tinyurl.com/4p937dn5
Apply here: tinyurl.com/4p937dn5
November 7, 2025 at 6:36 PM
The Fudge Lab at Chapman University is recruiting a postdoc for an NSF-funded project on the biophysics of hagfish defensive slime deployment. Please repost!
Apply here: tinyurl.com/4p937dn5
Apply here: tinyurl.com/4p937dn5
Bayesian analyses
I don't always make good decisions, but when I do, it's by accident
November 7, 2025 at 5:50 PM
Bayesian analyses
This is how I see all genAI users tbh.
Ryan Grim like:
November 7, 2025 at 2:40 PM
This is how I see all genAI users tbh.
Crocodylians surviving the K-Pg extinction.
November 6, 2025 at 3:24 PM
Crocodylians surviving the K-Pg extinction.
God gives his shortest jaws to his strongest soldiers
I dream of being a long snouted predator in the backwaters of Laurentian rivers, but for now I crush shells with my round teeth and am sad #garweek #scheenstiaposting #totalgroupginglymodi
November 6, 2025 at 2:54 AM
God gives his shortest jaws to his strongest soldiers
There’s going to be more theropod drama isn’t there.
November 5, 2025 at 5:11 PM
There’s going to be more theropod drama isn’t there.
Covering myself in a suit of scale armor as we speak
Live every week like it’s gar week
November 5, 2025 at 3:52 PM
Covering myself in a suit of scale armor as we speak
@reallyoldfish.bsky.social Tanyrhinichthys lives
Fucked up (but tragically Critically Endangered) fish I just learned about (Dwarf Sturgeon/Pseudoscaphirhynchus hermanni). Can't believe they managed to make a sturgeon weirder.
November 4, 2025 at 11:36 PM
@reallyoldfish.bsky.social Tanyrhinichthys lives
So excited to see this out, fantastic paper on some fascinating fishes from France!
New paper in JSP: Gonçalves & Luccisano reassess the taxonomy and phylogeny of Aeduellidae, Carboniferous ray-finned fish from Decazeville Basin, France 🐟
Results hint at a North American origin… or convergent traits that muddy the family waters.
Read the study: buff.ly/huDEsiU #paleosky #fossilfish
Results hint at a North American origin… or convergent traits that muddy the family waters.
Read the study: buff.ly/huDEsiU #paleosky #fossilfish
November 4, 2025 at 10:14 PM
So excited to see this out, fantastic paper on some fascinating fishes from France!
Tons of awesome phylogenetics in here
Congratulations to the authors of these contributions recognized as JSP Landmark Papers in Vertebrate Palaeontology!
www.tandfonline.com/journals/tjs...
www.tandfonline.com/journals/tjs...
JSP Landmark Papers in Vertebrate Palaeontology
Explore the article collection: JSP Landmark Papers in Vertebrate Palaeontology. Published in Journal of Systematic Palaeontology.
www.tandfonline.com
November 3, 2025 at 4:47 PM
Tons of awesome phylogenetics in here
Early actinopt anatomy in a nutshell
November 3, 2025 at 4:46 PM
Early actinopt anatomy in a nutshell
Settling down to watch football all weekend
November 1, 2025 at 4:31 PM
Settling down to watch football all weekend
Reposted by Jack Stack
Our new open-access book has been published today. Please download and share
www.degruyterbrill.com/document/doi...
www.degruyterbrill.com/document/doi...
October 31, 2025 at 6:37 PM
Our new open-access book has been published today. Please download and share
www.degruyterbrill.com/document/doi...
www.degruyterbrill.com/document/doi...
Thinking about palaeoniscoids
October 31, 2025 at 5:05 PM
Thinking about palaeoniscoids
House spiders learning that houses had been invented:
a man and a woman are dancing in a room with their hands in the air .
ALT: a man and a woman are dancing in a room with their hands in the air .
media.tenor.com
October 31, 2025 at 1:28 PM
House spiders learning that houses had been invented:
Students are dissecting invertebrates today, was really impressed with this grasshopper dissection.
October 30, 2025 at 10:35 PM
Students are dissecting invertebrates today, was really impressed with this grasshopper dissection.
Do we know if Nanotyrannus lived on land or was aquatic? I have a radical hypothesis that I will share soon.
October 30, 2025 at 6:49 PM
Do we know if Nanotyrannus lived on land or was aquatic? I have a radical hypothesis that I will share soon.
I will propose a new taxon, Exatyrannus, which is 1*10^27 the size of Nanotyrannus. No fossils of it yet because it’s larger than the Earth.
Now Nanotyrannus is real, we must go smaller. Microtyrannus next. Get to work palaeontologists
October 30, 2025 at 5:16 PM
I will propose a new taxon, Exatyrannus, which is 1*10^27 the size of Nanotyrannus. No fossils of it yet because it’s larger than the Earth.
Realizing I was right about Nanotyrannus based just on vibes.
a close up of a person 's hands touching a glass wall .
Alt: Hannibal hand meme
media.tenor.com
October 30, 2025 at 4:37 PM
Realizing I was right about Nanotyrannus based just on vibes.
Can anyone find the link to the actual paper?
Explore this gift article from The New York Times. You can read it for free without a subscription. www.nytimes.com/2025/10/30/s...
The Case of the Tiny Tyrannosaurus Might Have Been Cracked
www.nytimes.com
October 30, 2025 at 4:32 PM
Can anyone find the link to the actual paper?
Maybe it makes them harder to swallow? Cool animal.
Crazy-looking larval cusk eel with an impressive external gut. We’re still not sure why having the intestines on the outside is advantageous, but there must be a good reason 🤔
TL ~2.5cm
#cuskeel #larvalfish #deepseafish #deepseacreatures #blackwaterdiving #chrisgug #gugunderwater #gug
TL ~2.5cm
#cuskeel #larvalfish #deepseafish #deepseacreatures #blackwaterdiving #chrisgug #gugunderwater #gug
October 29, 2025 at 2:07 PM
Maybe it makes them harder to swallow? Cool animal.
I am so happy that animals like this still exist, and that people like Dr. David are working to conserve them.
BEHOLD the GARgantuan Alligator Gar!!!
This is the largest Alligator Gar I’ve encountered; at over 7 feet 10 inches (240 cm) and approximately 55 inches in girth, its weight is estimated at 300 pounds (136 kg)!
A true river monster, among the largest caught, tagged and safely released! #GarWeek
This is the largest Alligator Gar I’ve encountered; at over 7 feet 10 inches (240 cm) and approximately 55 inches in girth, its weight is estimated at 300 pounds (136 kg)!
A true river monster, among the largest caught, tagged and safely released! #GarWeek
October 29, 2025 at 2:07 PM
I am so happy that animals like this still exist, and that people like Dr. David are working to conserve them.
First draft of the response letter going great.
October 28, 2025 at 7:22 PM
First draft of the response letter going great.
!!!!!! Treespace is such an important and I think underused tool!
There's also a discussion of "treespace" and how different assumptions about character evolution can impact phylogenetic inferences
October 28, 2025 at 3:24 PM
!!!!!! Treespace is such an important and I think underused tool!