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Pasha van Bijlert

@pashavanb.bsky.social
1.4K followers 231 following 122 posts

Evolutionary biomechanist & Paleontologist 🇳🇱 Interested in how animals move PhD candidate at @uugeo.bsky.social & @naturalis.bsky.social 📷:Tom Brown

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Reposted by Pasha van Bijlert
Professor John R. Hutchinson @johnrhutchinson.bsky.social · 29/09/2026
New paper! Brandon Kilbourne conducted a huge data collection effort for the limb muscle architecture (masses, fascicle lengths, pennation angles; thereby PCSAs) of mustelid mammals. We found conspicuous relationships with morphology and locomotor mode. link.springer.com/article/10.1...
link.springer.com
Muscle architecture in mustelid mammals: anatomical proxies for muscle function and their relation to locomotor habit - BMC Ecology and Evolution
Background Though skeletal adaptations for locomotion in mammals are well documented, possible limb adaptations in terms of muscle architecture have received far less study. Examining mustelid mammals...
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Dr Stephan Lautenschlager @palaeostephan.bsky.social · 18/09/2026
Second new paper this week: Reconstructing the oral apparatus of the Silurian heterostracan Athenaegis. Led by @lisaschnetz.bsky.social and in collaboration with many colleagues, including @euphanerops.bsky.social (who rendered the animation) and @nitroshutter.bsky.social
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Hannah Byrne @hannahbyrne.bsky.social · 03/09/2026
Double preprint alert! 🚨 Jaws: Baby shark 🦈 We used micro-CT scanning to examine the tessellated calcified cartilage in the jaws of 10 young chondrichthyans in 3D. We found some surprises—like chunky trabeculae in a baby nurse shark! Many thanks to all my co-authors for their help and support!
biorxiv.org
Early Ontogenetic Development of Tessellated Calcified Cartilage in Chondrichthyans
Tessellated calcified cartilage (TCC) is a hallmark of the chondrichthyan skeleton, yet its development early in ontogeny across the four major groups (batoids, galeomorphs, squalomorphs, and holoceph...
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Anne Schulp @anneschulp.bsky.social · 03/09/2026
www.colourfuljobs.nl/vacatures/ju...
colourfuljobs.nl
Junior Tentoonstellingsconservator bij Teylers Museum
Werk mee aan de tentoonstelling Dinomakers bij Teylers Museum in Haarlem! Tijdelijke functie 24u/w voor een Junior Tentoonstellingsconservator.
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Professor John R. Hutchinson @johnrhutchinson.bsky.social · 07/08/2026
A little #ICVM2027 - Halifax, NS update: We have 11 accepted symposia (notifications coming in due course) and 3 workshops. There are great topics of broad interest to vertebrate morphologist-types!
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Stephan Spiekman @stephanspiekman.bsky.social · 29/07/2026
Excited to share our new paper in Science Advances! Led by Dr Wei Wang at #IVPP in Beijing, it presents a complete skeleton of #Austronaga, the most marine of all archosauromorphs. To boot, this fossil preserves the oldest complete digestive tract of any reptile! www.science.org/doi/10.1126/...
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Professor John R. Hutchinson @johnrhutchinson.bsky.social · 24/07/2026
We (several of us in our lab, and biomechanics colleague Andrew Biewener) wrote an obituary for the late Alan Wilson. Please read this little window into the life of a truly amazing scientist; one of a kind. It still shocks me to think he's gone. rdcu.be/fvHdX
rdcu.be
Alan M. Wilson (1964–2026)
Nature Ecology & Evolution - Visionary comparative biomechanist and physiologist who pioneered experimental methods for laboratory and field research into large-mammal locomotor performance and...
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Dr Mark D. Scherz @markscherz.bsky.social · 22/07/2026
I am thrilled to introduce seven new species of diamond frogs from Madagascar! A new monograph on the genus Rhombophryne published #OpenAccess in Vertebrate Zoology. 🧪🐸 doi.org/10.3897/vz.7...
A new species, Rhombophryne sonaliae, looking right at you. It looks a lot like Kaloula pulchra, aka chubby frogs, with its light flank stripes and dark brown top and sides, but is super shiny.
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j0nas-hakk3ns.bsky.social @j0nas-hakk3ns.bsky.social · 21/07/2026
My Bachelor's thesis has been published! We examined the problematic taxonomy of Zygorhiza kochii and Dorudon serratus, with implications for the wider taxonomy of the basilosauridae. A small thread:
sciencepress.mnhn.fr
On the identity of historical specimen TM 8501 and the taxonomy of North American Basilosauridae (Mammalia, Cetartiodactyla, Archaeoceti)
Phylogeny and taxonomy of early whales have always been a complicated matter, partly due to confusing nineteenth-century descriptions and diagnoses and a profusion of given names. A largely complete c...
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Narimane Chatar @narimanechatar.bsky.social · 16/07/2026
Excited to share our latest study highlighted on the cover of @science.org 🥳Combining a 3D dataset representing 250 taxa spanning the whole Cenozoic, 3D modelling & printing and material testing; we deciphered the form-function relationship in the lower 🦷 of mammals www.science.org/doi/10.1126/...
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Christopher Zobek @czobek.bsky.social · 15/07/2026
I’m happy to say the first chapter of my dissertation has just gotten published! Here, we compared the results of two prominent tools for measuring muscle architecture from contrast data, Xfiber and Goodfibes, with some recommendations for each. anatomypubs.onlinelibrary.wiley.com/doi/10.1002/...
anatomypubs.onlinelibrary.wiley.com
Relative performance of automated fiber‐tracking approaches to <fc>3D</fc> muscle architecture and their utility for comparative biomechanics
Muscle architecture is a key determinant of muscle performance, informing the calculation of functional traits such as force production and excursion distance. Due to its importance in understanding ....
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Pauline Provini @paulineprovini.bsky.social · 10/07/2026
#Biomechanics family pictures at #SEBconference in Florence! #SEB2026 @sebiology.bsky.social
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Prof. Christine Böhmer @vertevo.bsky.social · 08/07/2026
[1/2] Thank you very much for this great collaboration on #lagomorphs 🐇 Pillai et al @boehmergroup.bsky.social @uni-kiel.de 2026 Oikos. Home and away: allometry and #climate drive morphology of European #rabbits in their native and introduced range doi.org/10.1002/oik....
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Pasha van Bijlert @pashavanb.bsky.social · 08/07/2026
Had a great time presenting my final PhD chapter yesterday at SEB 2026 in Florence @sebiology.bsky.social Did you miss it, or just want to discuss dinosaur or emu locomotion? Come find me at the conference!
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Pasha van Bijlert @pashavanb.bsky.social · 01/07/2026
Do you use (musculoskeletal) physics simulations with contact spheres? Then my new paper in @jbiomech.bsky.social is for you! This is my first single-author paper, and the third published chapter from my PhD at @uugeo.bsky.social 🥳 Paper (open access): www.sciencedirect.com/science/arti...
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Meghan Bartels @meghanbartels.bsky.social · 24/06/2026
I’m so sad to share that yesterday was my last day at Scientific American. It was an honor to work alongside my incredible colleagues and to speak with researchers across the sciences. If you’re looking to hire staff or freelance, please consider me and my other laid off coworkers (🧵)
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Pasha van Bijlert @pashavanb.bsky.social · 24/06/2026
Since I got back from 🇦🇺 I've been so focused on finishing my PhD, I nearly forgot to do a follow-up! Spending ~4 months in @cjclemente.bsky.social's lab was an amazing experience, filled with animal biomechanics and of course - fieldwork! Here's one of our drone shots from the Strzelecki Desert
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Niklas Hohmann @niklashohmann.bsky.social · 24/06/2026
🚨 #preprint alert🚨 Everyone loves high resolution paleorecords, but what determines their temporal resolution and orderedness? New counterintuitive results with implications for #conservation #paleobiology and age depth modeling #sedimentology 1/n eartharxiv.org/repository/v...
eartharxiv.org
Sediment accumulation, rather than mixing, controls the temporal resolution of the sedimentological record
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Jordan Collver @jordancollver.bsky.social · 21/06/2026
Made these in celebration of all the dedicated dads of the animal world, and in memory of my stepdad.
Painted clay figurines of a gharial (long snouted green crocodilian) and a cassowary (colourful crested ostrich-like bird) with their respective young.
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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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Bart Braun @bartbraun.bsky.social · 11/06/2026
@pashavanb.bsky.social zat bij Klokhuis, dus ik mocht in een van de zoogdierendepots rondhangen onder werktijd.
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Rebecca Lowes @rebeccalowes.bsky.social · 05/06/2026
First paper of my PhD is out! 🎉 We ran a sensitivity analysis of digital range of motion and found that outcomes can vary a lot depending on how you select the articular surface or define joint centre. General takeaway is share your models alongside results! doi.org/10.1111/joa....
doi.org
Digital range of motion analysis is sensitive to subjective steps in joint model construction
A systematic sensitivity analysis of a six degree-of-freedom range of motion (ROM) analysis workflow was conducted to evaluate how variation in the subjective steps of the reference pose assembly aff...
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Liverpool EMB lab @livevobiomech.bsky.social · 04/06/2026
Muscles don’t just move you - sometimes they slam the brakes 🛑💪 New paper: starting length + temperature strongly reshape the biphasic force response during eccentric contractions
doi.org
Starting length and temperature dependence of eccentric muscle force–velocity behaviour
Summary: Eccentric muscle force development is highly sensitive to starting length and temperature, revealing distinct effects on contractile and elastic components and providing a framework for more ...
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Pasha van Bijlert @pashavanb.bsky.social · 01/06/2026
Interested in the Princeton Encyclopedia of Dinosaurs? Check out my review!
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Pasha van Bijlert @pashavanb.bsky.social · 25/05/2026
So cool! You can see how the chicken switches to a more columnar posture because it's Centre of mass is pulled closer to the hip!
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Armita R. Manafzadeh @armanafzadeh.bsky.social · 13/05/2026
Our work on mammalian hallucal grasping, led by Irene Montañez-Rivera during her time in the @johnnyakatura.bsky.social group, is out now in iScience. A true team effort; thanks to the whole crew for inviting me to contribute a small piece! www.cell.com/iscience/ful...
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Professor John R. Hutchinson @johnrhutchinson.bsky.social · 07/05/2026
Big day ahead. First live-animal studies I've done in our lab for a while. Alpacas moving through our gait lab including over soil, rough terrain and pressure pad. Lots of tech. Bio-inspired robot foot design with Dr. Sara Abad-Guaman from UCL. Hopefully some alpaca pics and video to come...
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Pasha van Bijlert @pashavanb.bsky.social · 19/04/2026
For those who want ellipsoid wrapping in their musculoskeletal models, I've worked out a simple implementation in @blender.org that will soon be added to MuSkeMo (github.com/PashavanBijl...).
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Dr. Todd L. Green @thecassowarykid.bsky.social · 27/03/2026
🚨NEW SCIENCE ALERT!🚨Read our new, open-access publication in Scientific Reports (@nature.com) describing #biofluorescence in #cassowary casques! Very excited to unveil this after keeping it secret for 5 years⬇️ www.nature.com/articles/s41... NYITCOM @akiopteryx.bsky.social @jonathanberman.bsky.social
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Pasha van Bijlert @pashavanb.bsky.social · 18/03/2026
It'll be emu time soon! (And also human, preying mantis, and guineafowl time!!)
media.tenor.com
a llama is standing on its hind legs in a desert .
ALT: a llama is standing on its hind legs in a desert .
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Professor John R. Hutchinson @johnrhutchinson.bsky.social · 06/03/2026
At the RVC we are grieving the death of the Structure & Motion Lab's creator, and stalwart comrade, Professor Alan Wilson FRS, from a plane crash in Namibia on Wednesday. He was a giant in comparative biomechanics and an amazing scientist. I'm still reeling. It is utterly shocking and deeply sad.
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Professor John R. Hutchinson @johnrhutchinson.bsky.social · 25/02/2026
New #DAWNDINOS paper! We do predictive simulations of vertical height jumping in the Triassic theropod Coelophysis & extant (tinamou) bird Eudromia. Mainly as sensitivity analysis of what parameters are most important. We show how crucial tail mobility is. royalsocietypublishing.org/rsif/article...
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Dr Matt Dempsey @sketchy-raptor.bsky.social · 24/02/2026
Substance Painter Day 3
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Dr. Oliver Demuth @oliverdemuth.bsky.social · 23/02/2026
I've released version 1.2 of my SDF simulations! This update further improves the runtimes: - Simple checking for collision between two meshes run at >150 FPS - Full 6DOF ROM simulations optimising the translations for each rotational pose run at >5.6 FPS - Ligament path estimation run at >5.1 FPS
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Pasha van Bijlert @pashavanb.bsky.social · 07/02/2026
Look at that head stabilisation!
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Adam Kewley @adamkewley.bsky.social · 09/01/2026
Thanks to @joss-openjournals.bsky.social for publishing OpenSim Creator's official announcement paper!
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Pasha van Bijlert @pashavanb.bsky.social · 24/12/2025
I'll take any opportunity to talk about emus🎉 🐦🎉. Many thanks for the award, and to @taylorjmdick.bsky.social and @cjclemente.bsky.social for organising the conference!
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Thomas Geijtenbeek @tgeijten.bsky.social · 03/12/2025
Working on a new obstacle course for musculoskeletal models #Hyfydy
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Dr. Oliver Demuth @oliverdemuth.bsky.social · 01/12/2025
The final PDF of our XROMM study on bird shoulders w/ @johnrhutchinson.bsky.social & @fieldpalaeo.bsky.social is now available at @jexpbiol.bsky.social!
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Dr. Oliver Demuth @oliverdemuth.bsky.social · 30/09/2025
Last week our in press manuscript was made available at @jexpbiol.bsky.social with the typeset version following soon. We conducted ex vivo XROMM experiments to determine the joint mobility in Red legged partridges and compared them with in silico simulations: doi.org/10.1242/jeb....
Accepted manuscript. Oliver E. Demuth, John R. Hutchinson, Vittorio La Barbera, Sharon E. Warner, Daniel J. Field; Soft tissue constraints on joint mobility in the avian shoulder. J Exp Biol 2025; jeb.250952. doi: https://doi.org/10.1242/jeb.250952
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Jack Tamisiea @jack-tamisiea.bsky.social · 19/09/2025
How did the ostrich cross the ocean? This fossil holds clues! This is the holotype of Lithornis promiscuus at the Smithsonian National Museum of Natural History. This heron-sized bird lived in a swampy floodplain in Paleocene Wyoming. #FossilFriday thread (1/4)
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Pasha van Bijlert @pashavanb.bsky.social · 18/09/2025
Made it to the Sunshine Coast to visit @cjclemente.bsky.social and (soon) @taylorjmdick.bsky.social for the next three months! We'll full be doing physics simulations and robot experiments in Chris's lab, and even some fieldwork studying the locomotor biomechanics of wild emus and kangaroos
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Liverpool EMB lab @livevobiomech.bsky.social · 15/09/2025
‼️📄 Two new papers out today in @jexpbiol.bsky.social lead by @jamescharles90.bsky.social, all about locomotion and load-carrying across different working dog breeds! ⤵️ 🐕 🏋️‍♂️ 🦮 (1/4)
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Armita R. Manafzadeh @armanafzadeh.bsky.social · 02/09/2025
I'm recruiting a PhD student to join the lab at @gtsciences.bsky.social in Fall 2026! Broad taxonomic and topical freedom under the umbrella of vertebrate joint form and function. Information here: www.manafzadeh.com – please share 🦴🩻
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Narimane Chatar @narimanechatar.bsky.social · 27/08/2025
New paper out today lead by @tsengzj.bsky.social where we test the 150-year-old hypothesis that the unique jaw torus in Nimravus is an adaptation to resist bite forces using FEA🦁🔪our results highlight some functional advantage of the torus, which are amplified at larger gape doi.org/10.1098/rsbl...
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Prof Susie Maidment @tweetisaurus.bsky.social · 27/08/2025
Hi all, me, @richardjbutler.bsky.social and the amazing UK-US-Moroccan team are delighted to announce that.. we have a new specimen of Spicomellus AND IT'S WAY WEIRDER AND WAY COOLER THAN WE EVER IMAGINED!!
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Pasha van Bijlert @pashavanb.bsky.social · 21/08/2025
We were recording an outreach video at @naturalis.bsky.social, when I realised we accidentally recreated the T rex chicken meme (with an emu of course ❤️ 🐦❤️)
T skeleton facing an emu skeleton with the text "Remember who you are"
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Royal Society Publishing @royalsocietypublishing.org · 16/08/2025
This new #RSOS study explores the biomechanical and behavioural significance of tails in sauropod #dinosaurs, focusing on the caudal series of the Late Jurassic species Giraffatitan brancai: royalsocietypublishing.org/doi/10.1098/... #palaeontology @daniajinn.bsky.social @pashavanb.bsky.social
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Pasha van Bijlert @pashavanb.bsky.social · 13/08/2025
We just published a Giraffatitan tail wagging paper, led by @daniajinn.bsky.social! Interested in bone-on-bone range of motions? Have a look! Fun fact: the Jurassic Park's Brachiosaurus was at least partly based on Giraffatitan
media.tenor.com
a man in a blue shirt is sitting in the grass and looking at something .
ALT: a man in a blue shirt is sitting in the grass and looking at something .
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Pasha van Bijlert @pashavanb.bsky.social · 28/07/2025
For everyone at #ISB2025 interested in musculoskeletal modeling, I'm giving a talk about MuSkeMo, my model construction and visualization tool, Tuesday 11:30 in Room A1 (Session 6A - Musculoskeletal Model Personalization). MuSkeMo is my tool for musculoskeletal model construction in Blender.
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