Day 7 of expedition in the Triassic site of TX (Princeton University and UTokyo joint expedition). Enjoyed prospect and painful cactus🌵

Got the jacket (phytosaur skull) capped before getting rained out!

Spent Saturday in the museum collections at Texas Tech, thank you to curator Jeff Martz for being such an obliging host

A phytosaur skull and lots of sediment from vertebrate microsites to screenwash—successful fieldwork so far!

PL retweet. Developmental Biology Course (Quintay). More information: biodesarrollo.unab.cl

Day2 of expedition in TX A lot of stuffs and variety of cute lizards

Great to be back in the field! The Triassic of Texas

Our publication, led by Meredith Taylor, is officially out in print. Thank you to @anatrecord.bsky.social for selecting my #artㅤㅤㅤㅤ for the cover of the June issue! The image depicts cleared & stained specimens of an embryonic #chicken (left) and #emu (right).

New paper! We conducted a preliminary histological survey of the vertebrates from the Late Triassic Pebbly Arkose Formation of Zimbabwe. This assemblage (230 Ma) contains the oldest-known definitive dinosaurs from Africa! doi.org/10.1111/joa....

Excited to dig into this, and thrilled to find some of our bird embryonic work featured here!

Reptile eggs come in all shapes and sizes. Here are two bird extremes in the @griffinlabpaleo.bsky.social right now: bobwhite quail and ostrich eggs. Most gecko species also make hard-shelled eggs and are tiny by comparison, like these Hemidactylus and Sphaerodactylus eggs. #BirdEvoDevo#GeckoEvoDevo

Excited to have this out!

Paul Barrett will be hosting a technical talk at #DinoConUK 2026 about Zimbabwe’s dinosaur heritage and new fieldwork that has yielded surprising results. Paul is Head of Fossil Vertebrates & Palaeoanthropology at the Natural History Museum, London. He has published nearly 250 scientific papers.

The newest member of the lab, the Choros lightsheet microscope from @miltenyibiotec.bsky.social. The largest lightsheet on the market, we can rapidly image entire late-stage embryos in extremely high (cell-level) resolution. Many thanks to Princeton's Dept. of Geosciences for funding the purchase!

Excited that my paper on a Jurassic fish with teeth on its nose is now out! Shoutout to my co-authors Ben Kligman and Maranda Stricklin, who is another all-star undergraduate mentee. onlinelibrary.wiley.com/doi/epdf/10....

More diverse than expected: osteohistology of non-crocodylomorph Pseudosuchia from the Triassic of South America onlinelibrary.wiley.com/doi/10.1111/...

#FossilFriday some casts of the incredible dinosaur fossils from the Gobi Desert in the AMNH’s new ‘Dinosaurs of the Flaming Cliffs’ exhibit honoring our late curator Dr. Mark Norell, and his decades of work in the Gobi with Dr. Mike Novacek and many more.

Postdoc @aaronhgriffing.bsky.social showing off some cool new methods and data at the NYC Miltenyi lightsheet microscope users symposium

Excited to attend NERVES at NYIT today!

The dawn of the Phanerozoic: A transitional fauna from the late Ediacaran of Southwest China | Science www.science.org/doi/10.1126/...

Just got back from an amazing trip to Japan with the @griffinlabpaleo.bsky.social to work on evo-devo-paleo collaborations with the Hirasawa group at UTokyo

Last week we had an incredible time visiting the lab of Tatsuya Hirasawa, with whom we're collaborating as part of a joint Princeton-UTokyo grant. Seeing hagfish eggs, learning new techniques, and exchanging ideas and planning new projects. Can't wait for our next visit!

#Zebrafish🐟 #Pericyte Progressive mural cell deficiencies across the lifespan in a foxf2 model of cerebral small vessel disease #SciArt from Dr. Sarah Childs lab😍 #eLife 2026 elifesciences.org/articles/106... Cleared wild-type 3-mpf 🐟brain pdgfrβ (blue) kdrl (red)

New paper in @journalofanatomy.bsky.social with PAD Wise and AP Russell! We show that using morphological criteria to assign developmental stage provides more ossification sequence resolution than embryo size or developmental time (days). onlinelibrary.wiley.com/doi/epdf/10.... #GeckoEvoDevo

🚨 Hot off the press: Our look into of the palaeontological database landscape and its sustainability into the future. Palaeo databases are invaluable and continue to transform our research field - but they are vulnerable... (1/6) 🧪 ⛏️ www.nature.com/articles/s41...

In bird embryology you occasionally get an unfertilized “dud” egg. @lnwilson.bsky.social, not wanting her emu eggs to go to waste, used a dud egg to make a beautiful cake for the lab!

For your delight and amusement, here are some dinosaur gastroliths, underneath the ribs of an Early Jurassic sauropodomorph from Zimbabwe 🦖🇿🇼

Not a big baby! My commentary in @science.org about the latest Nanotyrannus research. www.science.org/doi/10.1126/...

Why does life explore so few of the forms it could possibly take? Using fractal descriptors, this #scienceadvances paper shows that Earth’s biosphere clusters around simple shapes, reflecting deep evolutionary constraints. @artemyte.bsky.social @manlius.bsky.social www.science.org/doi/pdf/10.1...

Our lab is growing: we will have openings for student and staff positions throughout the year. Please visit edwards-lab.org for the most up to date job positions. I am excited to work with the department and looking forward to the months ahead!

A few new papers out recently that I'm excited to share with you! First: How well could stem reptiles hear? www.nature.com/articles/s41...

Another cool paper, glad to see it finally out: www.nature.com/articles/s41... Figuring out the range of error that exists, & factors influencing offsets, between growth marks and ontogenetic age remains a challenge for estimating growth curves from bone histo data. More work like this is needed.

The Vertebrate Paleontology students did a great job 3D printing and painting skulls—look at that homology!

The discovery that Nanotyrannus is a distinct species from the T-rex indicates complex food web and interspecies interactions in the Dinosaur world. This research was funded by NSF post-doc grants, which were just archived, i.e., they're no longer available. news.yale.edu/2025/12/04/t...

Congratulations to UMMP Associate Research Scientist Miriam Zelditch on the release of the third edition of the indispensable "Geometric Morphometrics for Biologists" (a.k.a. the green book)! #FossilFriday

#FossilFriday The awesome new article in Science by @griffinlabpaleo.bsky.social et al. adds more evidence for the validity of Nanotyrannus by showing that the hyoid bone in the holotype has adult bone histology. Here are some more images showing the ceratobranchial bone in place in the skull. 🦖

Development of the zebrafish retina captured on a light sheet microscope. Credit to @ichajaroslav.bsky.social. #ZebrafishZunday 🧪

Very excited to share that our latest paper is out in Science! We show that the type specimen of Nanotyrannus—an isolated skull—is fully grown, showing that it is not a juvenile Tyrannosaurus rex but a distinct species (1/12) www.science.org/doi/10.1126/...

'Tis the season for graduate school applications, so here's a reminder that I'm recruiting! My lab uses a combination of fossils, statistical phylogenetics, fieldwork, & computational methods to study macroevolutionary dynamics in the marine biosphere. Check the link below & feel free to reach out

Happy to be a part of this big project led by Mario Bronzati & Matteo Fabbri—out today #OA in @currentbiology.bsky.social bit.ly/3M5weun —on the brain endocast of a close pterosaur cousin & what it means for pterosaur brain evolution...maybe different from bird brain evolution. 1/2

The Nishikawa lab at Northern Arizona University and the NSF-funded Integrative Movement Sciences Institute are hiring a postdoc to help develop multiscale muscle models - please apply and share widely! careers.nau.edu/cw/en-us/job...

Innovative and interesting work here by @caleb-m-gordon.bsky.social, so happy to be part of it!

New IJDB issue! Our cover image features an immunostaining of neural crest cells and their derivatives in an Mllt1 E10.5 murine embryo from the paper by Zinck et al doi.org/10.1387/ijdb... Congratulations to the team of @aineurolab.bsky.social for their outstanding contribution!

Join us in Sheffield! We are keen to support early career researchers in applying for independent research fellowships (IRFs) to join our friendly and collaborative environment, in areas related to developmental biology, stem cells and regenerative biology, and neuroscience.

Princeton has a great showing at #SVP2025! See our work on such diverse topics as baby stem-crocodylians, mammal tooth isotopes, dinosaurian energy/fitness models, and ostrich development. #2025SVP

Our big squamate origins and early evolution review is now fully published as open access! with @marcanthonytollis.bsky.social and F. Burbrink www.annualreviews.org/content/jour...

Flashback #FluorescenceFriday to some of the first light-sheet imaging we were doing. Video shows the collecting duct system of the developing kidney labeled with a pan-cytokeratin antibody. Courtesy of former talented technician Deanna Hardesty.

Had a wonderful visit from collaborator Tatsuya Hirasawa from the U of Tokyo! We’ve been awarded a joint Princeton-Tokyo grant to exchange exciting new techniques in vertebrate evo-devo. Our visit to Japan will happen in March!

Opening a field jacket in the new prep lab! Preparator Jack Wilson will work his way through the matrix to the croc skull hiding inside

‼️‼️Triassic Life just opened @smnstuttgart.bsky.social‼️‼️ For all #Triassic fans, lovers of strange reptiles and the Dawn of the Modern World, this is an absolute MUST! It also couldn't be more timely with our recent publication @nature.com of the wonder reptile #Mirasaura, which is now on display!