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@captain-colosteid.bsky.social
67 followers 123 following 118 posts

Paleo Mutt ⚫️⚪️🟤🤟🏿🕉 📿 💜 PhD student at Uppsala University 🇸🇪

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Reposted by K
Xavier A. Jenkins @semifossorial.bsky.social · 30/09/2026
Out today: We show that Westlothiana lizziae or "Lizzie," described 35 years ago as the world's oldest reptile - is not a stem amniote at all, but a stem tetrapod. www.nature.com/articles/s41...
The part and counterpart of the holotype specimen of Westlothiana. Paleoartistic reconstruct of Westlothiana by Jacob Schick based on our new data
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J Pardo @jdpardo.bsky.social · 29/09/2026
Posting for your consideration, without comment.
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Per Ahlberg @perahlberg.bsky.social · 25/09/2026
Here's a petition to save the Academy of Natural Sciences in Philadelphia. Please sign, the closure of this wonderful museum would be a disastrous loss to Philadelphia and the world. actionnetwork.org/petitions/pe...
actionnetwork.org
Petition to Keep the Academy of Natural Sciences Open to the Public
The scientific community in Philadelphia and concerned neighbors are calling on Drexel University to keep the Academy of Natural Sciences of Philadelphia’s public-facing museum open beyond their impos...
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K @captain-colosteid.bsky.social · 24/09/2026
static.klipy.com
Wayne's World: Excellent Thumbs Up
ALT: Wayne's World: Excellent Thumbs Up
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Emily Troyer @fishfetisher.bsky.social · 22/09/2026
Asking very important, serious questions at the OMNH fish collection
A small whiteboard. On it is written: if a fish wore pants, how would it look like? There are 2 bad drawings of a fish with pants
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K @captain-colosteid.bsky.social · 22/09/2026
Waiting in the Boston Airport, rereading Pardo et al. 2017 (Hidden morphological diversity among early tetrapods), with the highlight specimen from that paper, Lethiscus, in my bag. We are rescanning it at the ESRF to take a closer look at the stapes & inner ear Attached are figures from said paper
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K @captain-colosteid.bsky.social · 21/09/2026
Guess what's in my bag @perahlberg.bsky.social
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K @captain-colosteid.bsky.social · 21/09/2026
Flying to Boston to acquire and transport a specimen for scanning. I have tons of legroom and most importantly nobody is sitting next to me! I pray to have the same luck flying back.
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PALAEONAVIX @palaeonavix.bsky.social · 17/09/2026
Eogyrinus, stem tetrapod or stem amniote, from the Carboniferous #embolomere #sketch #research #reptiliomorph #tetrapoda #carboniferous
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Dr Stephan Lautenschlager @palaeostephan.bsky.social · 15/09/2026
New paper out today! Led by Daniel Schwarz, we retrodeformed the skull and reconstructed the cranio-mandibular musculature of the giant stem-amphibian Mastodonsaurus giganteus. Our results show that Mastodonsaurus had a powerful bite and a crocodile- like bite-and-hold feeding style.
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Hady George @houdzgeorge.bsky.social · 16/09/2026
Welcome Dinodontosaurus isiyavamanda! I'm delighted to introduce you to a new species of protomammal. Hailing from the Triassic of Tanzania, this is the first record of Dinodontosaurus outside of South America, and it informs on the origin of dinosaurs. Here's a thread summarising our findings 🧵
Life reconstruction of two Dinodontosaurus isiyavamanda individuals by Gabriel UguetoSkull and jaw of the holotype of Dinodontosaurus isiyavamanda. Original photos by Jonathan Jackson
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Mychal Threets @mychal3ts.bsky.social · 09/09/2026
Ruby Bridges was 6-years-old when she stepped into the history books. Bravely accompanied by her mother, she was the first Black child to desegregate an all-white school in the South. It was not long ago… Today is her birthday. She is still with us. She is 72. Happy birthday, Ruby Bridges 💜
Young Ruby Bridges, photo in black and white Ruby Bridges today, photo in full color
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J Pardo @jdpardo.bsky.social · 08/09/2026
The fossil record asking you to take it literally just one more time
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K @captain-colosteid.bsky.social · 08/09/2026
When giant amphibians rule the river: Community trophic structure of Japanese giant salamander ecosystems
pmc.ncbi.nlm.nih.gov
When giant amphibians rule the river: Community trophic structure of Japanese giant salamander ecosystems
Top predators strongly influence food webs, often because they reach large body sizes. Amphibians are typically regarded as prey in such systems, but giant salamanders are a rare exception. Because gi...
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Kevin Sievers @diplotomodon.bsky.social · 07/09/2026
The website is up: save-the-academy.org Important info, contact points, and news articles within
save-the-academy.org
Save the Academy of Natural Sciences
Don't mourn — organize. Rally Tue Sept 8, 10 a.m., 1900 Ben Franklin Pkwy. Nine things you can do today.
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Andrej Spiridonov @andrejpaleo.bsky.social · 04/09/2026
Wonderful world of cephalopod evolution in deep time... " Here we provide an overview of some exciting fields in cephalopod research, where (in our biased opinion) the most impressive advances have been made." 🧪⚒️ #Geology #Paleobio #EvoBio www.cambridge.org/core/journal...
Morphological changes during the evolution from bactritids (top) to the first and slightly derived Devonian ammonoids and changes in ecology.
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Ethan Baxter @ethanrockstory.bsky.social · 06/09/2026
⚒️🍎🧪🦖 Meet Cameron Muskelly @cambriancam.bsky.social, a paleontologist from Georgia who has been exploring ancient life since he was a child. Hear his inspiring story of how he got his start! Want to hear more from Cam? Watch the full episode with your kids: youtu.be/P0QJXHwHkCM
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K @captain-colosteid.bsky.social · 06/09/2026
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Sarah McAnulty, Ph.D. @sarahmackattack.bsky.social · 05/09/2026
Please repost! Drexel announced that it will close the Academy of Natural Sciences public museum- the oldest nat history museum in the US. There are 2 petitions to support the academy. Please sign both & come to our rally Tues. actionnetwork.org/petitions/pe... www.change.org/p/the-academ...
A poster featuring the T-Rex at the cognitive natural sciences, which says save the Academy natural sciences, museum rally in front of the academy 1900 Ben Franklin Parkway, Tuesday, September 8 10 AM. The T-Rex is saying tell Drexel keep the museum open. There’s an RSVP QR code and then the logos of Philly Science Action Skype scientist In Philly on the bottom.
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K @captain-colosteid.bsky.social · 05/09/2026
Visiting the Kurt Vile mural in Fishtown, Philadelphia has been on my bucket list for a few years now. I forgot how much I love Philly… too bad this was just a stop on the way to Wellfleet, Massachusetts.
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Kenneth De Baets @djbirddanerd.bsky.social · 04/09/2026
Interpreting Biotic Interactions in the Fossil Record: Evidence and Evolutionary Significance #paleobiology #paleobiology #fossils #ecology #evolution #EarthHistory #biodiversity
doi.org
Interpreting Biotic Interactions in the Fossil Record: Evidence and Evolutionary Significance
Fossil biotic interactions (fBIs) provide a critical but underutilized window into the ecological and evolutionary dynamics of life through time. Unlike modern ecological data, the fossil record captu...
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J Pardo @jdpardo.bsky.social · 04/09/2026
Miracinonyx was a versatile predator/scavenger of small, largely aquatic, prey, with small but stable populations extending north into the Yukon. So much for the "Miracinonyx were specialists at hunting pronghorn antelope" story. www.cell.com/current-biol...
cell.com
Range and diet diversity in the Pleistocene American “cheetah,” Miracinonyx trumani
Cassatt-Johnstone et al. use paleogenomics to show that extinct American cheetahs were most closely related to pumas, not cheetahs. These cats ranged far into the Arctic and exploited aquatic prey, th...
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Scott Williams @museumguyscott.bsky.social · 01/09/2026
#AcademyofNaturalScienceMuseum is closing!!!?? This is terrible news! www.inquirer.com/education/ac...
inquirer.com
The Academy of Natural Sciences is closing its museum after nearly two centuries
The closure does not affect the rest of the institution, which builds and maintains the collections and conducts research through departments such as the Patrick Center for Environmental Research.
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Dr. Holly Walters @manigarm.bsky.social · 28/08/2026
To hell with this coddled old pervert. It's Turtle Island, then, now, and forever.
static.klipy.com
Turtle Helps Another Turtle Flip Over
ALT: Turtle Helps Another Turtle Flip Over
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J Pardo @jdpardo.bsky.social · 27/08/2026
We're posting geckos?
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K @captain-colosteid.bsky.social · 24/08/2026
It’s a good day if I get to see a red bed.
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K @captain-colosteid.bsky.social · 20/08/2026
I’ve waited 5 long years to gain access to this quarry, but they are finally letting us in on Monday.
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Robin Saulnier Masson @robinslnr.bsky.social · 19/08/2026
🚨Excited to share my first PhD paper, out in Journal of Morphology 🐸 With @kengelkes.bsky.social, we studied the ontogeny and homology of anuran forelimb muscles across 11 species, resolving long-standing inconsistencies in their nomenclature and homology. First step of many! doi.org/10.1002/jmor...
doi.org
Ontogeny and Homology of the Shoulder Joint and Forelimb Muscles in Frogs and Toads (Lissamphibia: Anura)
The ontogenetic development, innervation, and morphology of the shoulder joint and forelimb muscles were investigated in 11 anuran species. The results reveal largely conserved splitting patterns of ...
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Andrej Spiridonov @andrejpaleo.bsky.social · 17/08/2026
Popular exploration of our recent study on state shifts in climate, carbon cycle and the associated mass extinctions. www.sciencealert.com/critical-tra... 🧪⚒️ #Geology #Paleobio #EvoBio
sciencealert.com
Earth's Chemistry Did Something Strange Right Before Its Biggest Mass Extinctions
Life on Earth, beginning with simple microorganisms that evolved and diversified into the incredible breadth of species living today, has always been turbulent.
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Matt Friedman @friedmanlab.bsky.social · 12/08/2026
One of the most remarkable deep-sea fish groups now has a paleontological record. Ridolfi and colleagues report the first fossil stylephorid (tube-eye) from the middle Eocene of Iran. #OA in Papers in Palaeontology: onlinelibrary.wiley.com/doi/10.1002/...
Fossil of a long, slender fish coiled over itself on a beige piece of rock. Image from Ridolfi et al. 2026. A new fossil from the Eocene of Iran provides new insights regarding the evolution of the morphologically bizarre tube-eye fish. Papers in Palaeontology 12: e70114. Shared under CC BY 4.0.
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Per Ahlberg @perahlberg.bsky.social · 12/08/2026
🧪Another open-access paper from our lab came out a while ago but I forgot to post a link, so here it is. Ossification of the pectoral fin skeleton of a phylogenetically basal stem lungfish. Based on the same material as my very first paper, from 1989! link.springer.com/article/10.1...
link.springer.com
Ossification of the pectoral fin of Glyptolepis groenlandica: implications for the evolution of the lungfish appendicular skeleton - Developmental Biology Advances
Developmental Biology Advances - Lungfishes are commonly considered to be the sister group to tetrapods. They appeared around 415 million years ago, then rapidly evolved, diversified and spread....
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Per Ahlberg @perahlberg.bsky.social · 11/08/2026
🧪I'm delighted to present a new open-access paper from our team, describing the contents of a fish coprolite assemblage from the beginning of the Late Devonian, about 382-380 million years old, in northern Russia. Data collected in happier days before the war. www.nature.com/articles/s41...
nature.com
Investigating a Devonian vertebrate assemblage with synchrotron microtomography of coprolites - Scientific Reports
Scientific Reports - Investigating a Devonian vertebrate assemblage with synchrotron microtomography of coprolites
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Ed Stanley @drscanley.bsky.social · 08/08/2026
Our latest paper started out as a DDIG project 14 years ago and grew into an interdisciplinary reassessment of Madagascar's oldest fossil lizard, showing that Konkasaurus mahalana is a gerrhosaur and the earliest known colonization from Africa by an extant Madagascan lineage. doi.org/10.1093/zool...
A CT scan of the fossil lizard Konkasaurus mahalana showing bones and osteoderms
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K @captain-colosteid.bsky.social · 05/08/2026
onlinelibrary.wiley.com/doi/pdf/10.1...
onlinelibrary.wiley.com
A giant plagiosaurid temnospondyl from Bjørnøya (Svalbard, Norway) and the origin of the plagiosaurid body plan
An articulated temnospondyl skeleton from Middle Triassic deposits of Bjørnøya (Bear Island) in the western Barents Sea is described as a new plagiosaurid genus and species, Arctobatrachus urdensis. ...
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K @captain-colosteid.bsky.social · 03/08/2026
We stumbled across a rather substantial collection of junkyard art in Wyoming. I jokingly named This Ichthyostega wyomingensis…
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K @captain-colosteid.bsky.social · 03/08/2026
A prairie rattlesnake (Crotalus viridis) I encountered in Montana. Sadly my camera was at camp, and I did not have my snake hook to carry the snake back to camp.
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Weird Spy Satellite @weirdsatellite.bsky.social · 27/07/2026
SIGINT #88035 from MENTOR (TOP SECRET) 1. Pit of Coelacanths 2. A Matchmaking 3. AI Light
Aerial satellite photo labelled in bright yellow letters: 

1. Pit of Coelacanths
2. A Matchmaking
3. AI Light

Actual coordinates: 55.3378° N, 120.1293° W
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Emily Troyer @fishfetisher.bsky.social · 10/07/2026
The Sam Noble Museum is hiring a Collection Manager for the Fish Collection! Come work with me in Oklahoma! Please share widely! #TeamFish #MuseumJobs jobs.ou.edu/jobs/curator...
jobs.ou.edu
Curator Archivist - Norman, Oklahoma, United States
Pay Range: Targeted salary $18.99 per hour, based on experience Benefits Eligible: Yes Work Schedule: Monday – Friday, 8:00 a.m. to 5:00 p.m. (may include some weekends) Travel: May be required For Be...
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K @captain-colosteid.bsky.social · 30/06/2026
pnas.org
PNAS
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans...
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suzette sommer @suzette.bsky.social · 20/06/2026
open.substack.com/pub/thebwsti...
open.substack.com
We Stopped Them: How Black Voters Defeated Georgia’s Redistricting Attack
Faith and community leaders force GOP hand as southern states rush to weaken Black political power
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K @captain-colosteid.bsky.social · 19/06/2026
Happy Juneteenth! But for me it’s never really that happy. Every year this day comes and I’m overloaded with happiness and sadness. Is Juneteenth a day of celebration or grieving? It‘s really hard being African American in paleontology, especially in my field of study... It’s quite lonely.
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J Pardo @jdpardo.bsky.social · 18/06/2026
New in @science.org ...since our first discoveries of early tetrapods, they have been thought of as "amphibians" characterized by aquatic larvae. But is this true? For the first time, we report exceptional fossils of stem tetrapod babies that upend this paradigm. 1/n www.science.org/doi/10.1126/...
science.org
Direct development of stem tetrapods across the fin-to-limb transition
Modern amphibians are characterized by an aquatic larval stage that ends abruptly with a period of widespread tissue remodeling (metamorphosis) upon transition to terrestrial adulthood. A transient la...
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Darren Naish @tetzoo.bsky.social · 10/06/2026
New at Tetrapod Zoology .... The Amphiuma Head and Skull tetzoo.com/blog/2026/6/... #amphibians #salamanders #herpetology
tetzoo.com
The Amphiuma Head and Skull — Tetrapod Zoology
Salamanders have been covered at Tet Zoo on numerous occasions, there being articles on newts and other salamandrids, plethodontids (lungless salamanders) of numerous sorts, and also ambystomatids (th...
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J Pardo @jdpardo.bsky.social · 09/06/2026
New (fragmentary) fossils extend the record of salamandrids (newts and allies) into the Cretaceous of Europe. Not a shocker given their close relatives also have Cretaceous records, but good to see, regardless. www.nature.com/articles/s41...
nature.com
New fossil evidence from the Late Cretaceous of Europe (southern France) deepens the origin of Salamandridae (Urodela) and refines the biogeography of the family - Scientific Reports
Scientific Reports - New fossil evidence from the Late Cretaceous of Europe (southern France) deepens the origin of Salamandridae (Urodela) and refines the biogeography of the family
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Dr. Davey F. Wright ⛏️🦕🧬 @daveyfwright.bsky.social · 03/06/2026
Absolutely overjoyed to share our new paper describing the oldest occurrence of soft-tissue preservation in crinoid echinoderms and their ecological significance 🧪
royalsocietypublishing.org
Exceptional soft-tissue preservation reveals the oldest evidence for tube feet and their ecological significance in crinoids
Abstract. Tube feet are extensions of the echinoderm water vascular system that play essential roles in feeding and ecology in living crinoids. However, on
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Claude ✡️🦖🦕 @cascoclauda.bsky.social · 28/05/2026
featuring art by @serpenillus.bsky.social and skeletals by @literallymiguel.bsky.social, an explosive new paper by @semifossorial.bsky.social et al. finds that testudines are archosauromorphs 🐢 it also recovers eunotosaurus within millerettidae
a figure from the paper showing skeletal diagrams leading up to testudinata, and a phylogenetic analysis recovering pan-testudines within archosauromorpha, and eunotosaurus as a millerettid; it also features a life reconstruction of eunotosaurus by gabriel ugueto
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J Pardo @jdpardo.bsky.social · 28/05/2026
New paper. Modern hagfishes (Myxiniformes) have radically reduced eyes. When did these reductions happen, and how? Leveraging the diverse hagfish fauna from Mazon Creek, we show this happened gradually in animals occupying shallow marine environments royalsocietypublishing.org/rsbl/article...
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J Pardo @jdpardo.bsky.social · 27/05/2026
A few years back, we described Gaiasia, a giant stem tetrapod from the early Permian of Namibia. This summer we're going back, looking for the rest of Gaiasia's ecosystem. Stay tuned!
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J Pardo @jdpardo.bsky.social · 17/05/2026
Something we are missing in this discussion of LLM-generated text is that scientific papers are not a dispassionate report of data and results. They are an arguments for the unique evidentiary value of specific datasets or analyses among the wide range of data and analyses already available.
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Thomas R. Holtz, Jr. @arctomet.bsky.social · 06/05/2026
Intraskeletal variability in osteohistology and growth record in a single individual of Sclerocephalus nobilis (Temnospondyli; Early Permian) royalsocietypublishing.org/rsos/article...
royalsocietypublishing.org
Intraskeletal variability in osteohistology and growth record in a single individual of Sclerocephalus nobilis (Temnospondyli; Early Permian)
Abstract. The osteohistology and growth record of eight bones from a single individual of the Permian temnospondyl Sclerocephalus nobilis were analysed. Th
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