Super excited to share our new paper, out today @pnas.org 'Teeth outside the jaw: Evolution and development of the toothed head clasper in chimaeras' @karlycohen.bsky.social 👻🦈 🦷 www.pnas.org/doi/10.1073/...

New paper is officially out! Ratfish have a second jaw on their foreheads - CT + histology show they’re real teeth, built from the same tissues and signals as oral teeth. www.washington.edu/news/2025/09...

Salut les francophones 👋 Vous aimez la science et les animaux mignons ? Alors j’ai ce qu’il vous faut ! Dans ce fil, je vous explique ce que les molaires des campagnols nous apprennent sur l’ #évolution (le post n°16 va vous surprendre !) 🐭🦷🤯 #vulgarisation #thèse #paléontologie

Notre dernier article montre que le mode de développement des dents a influencé des millions d’années d’évolution des campagnols, menant à des molaires très complexes. Qu’est-ce que ça nous apprend sur l’évolution ? 🧵👇 1/21 #evodevo #vulgarisation 📷 Hanna Knutsson (CC BY-NC-ND 2.0)/Lafuma et al.

A tiny lizard-like fossil from Devon, UK, dating to around 244–241.5 million years ago, may now be the oldest known member of the group of reptiles known as lepidosaurs, according to a paper in Nature. go.nature.com/3Iitbxp #Paleosky 🧪

happy #fossilfriday! bonus: this is nihohae, a waipatiid dolphin from the oligocene of new zealand. the 2023 paper describing the taxon suggests that nihohae hunted and fed in a manner analogous to sawsharks, preying predominantly on soft-bodied cephalopods such as squid (art by shunovachrono)

In #pterosaurs, hollow bones appeared before flight. Rare fossil evidence reveals the precursors to air-sac-studded skeletons. In PNAS Journal Club: www.pnas.org/post/journal... #FlyingReptiles #paleontology #Caiuajara #Brazil #dinosaurs

me: of course I can make a graphical abstract the graphical abstract:

For #FossilFriday, a 2-for-1 special with a Late Cretaceous body fossil (ammonite) bearing tooth traces of a biting mosasaur matching the dental records of _Platecarpus_. Display seen at the U. of Michigan Museum of Natural History (Ann Arbor MI) in June '24. 🧪🦷🕳️ #ichnology

Smile like Smilodon because it’s #FossilFriday! Scientists estimate that its signature teeth grew at the rapid speed of .24 in (0.6 cm) per month—double the growth rate of an African lion’s teeth. Smilodon could open its jaws twice as wide as today’s big cats.

For this week's #FossilFriday, here's a *gorgeous* tooth from our new species of iguanodont dinosaur in the Cedar Mountain Formation, Grand County, Utah. This beastie will help clarify the early evolution of iguanodontids, so I'm quite excited for it to (eventually) get published!

In our latest paper we found that tooth development shaped the evolution of voles for millions of years, leading to highly complex molars. How can we tell? What does it teach us about evolution? A thread 🧵👇 (1/20) #evodevo #ToothyTuesday 📷 (L) Hanna Knutsson CC BY-NC-ND 2.0 📷 (R) Lafuma et al.

It’s finally out! Our work addressing the origins of reptiles is published in PCJ! peercommunityjournal.org/articles/10.... We use novel info gleaned from the scan data of dozens of stem reptiles to substantially revise our understanding of early reptile evolution #paleontology #herpetology

Out today in Nature is the most exciting dinosaur paper I've ever been involved in - led by @tweetisaurus.bsky.social we describe a partial skeleton of the UTTERLY BIZARRE Spicomellus from the Middle Jurassic of Morocco, the oldest known ankylosaur. (1/x) www.nature.com/articles/s41...

🧪🚨Ever wondered why plant leaves 🍃look the way they do? Glad to contribute to work by Jamie Malone & team on developmental bias toward simple leaves! But there’s a backstory to it 1/4 www.biorxiv.org/content/10.1...

🚨 We're hiring! PhD position in Evolutionary Systems Biology at Stockholm University & SciLifeLab 🎓 Focus: evolution, development, computational & mathematical modeling, prediction 📍 Stockholm, Sweden 🕒 4 years, fully-funded 🔍 Details: su.varbi.com/en/what:job/... Please share!

Only got a minute? Learn about our study on how tooth #development shaped the #evolution of vole molars with a bite-sized summary on @growkudos.bsky.social. Something to chew on for #ToothyTuesday 🤓🐭🦷 link.growkudos.com/1e27am025fk

Welcome to the world, Nujalikodon cassiopeiae! This little mammaliaform from Greenland is the oldest definitive docodontan, telling us more about this important clade's origin and palaeography, and how their complex teeth evolved. (Artwork by Pedro Andrade)

📢 deeptime: an R package that facilitates highly customizable and reproducible visualizations of data over geological time intervals 🔗 doi.org/10.1080/2096... Fully #openaccess in @bigearthdata1.bsky.social with insight about deeptime📦 development and code examples! #rstats #geology #paleontology

Happy #FossilFriday from Walker, the first Mosasaurus skeleton found in Kansas. We excavated this 28 foot long murder lizard in 2014 and its reconstruction was my Covid work from home project This cast is now part of a traveling exhibition in Japan, showing off all of its teeth to visitors

🚨New PhD research published in PNAS!🚨 Combining fossils and lab experiments, we found that simple changes in tooth #development explain 6 million years of molar #evolution in #voles 🐭🦷 Shoutout to my coauthors @cnrs.fr @helsinki.fi @gtk-fi.bsky.social! www.pnas.org/doi/10.1073/... #FossilFriday

You’ll all have seen the many announcements and PR pieces from #ColossalBiosciences. There are reasons to be concerned about the general message promoted by CB, one being that it is seen >by some< (US politicians in particular) as meaning that we can devalue conservation. A 🧵 1/n

Out today in @plosbiology.org! We show that two major advances in fish feeding - highly protrusible jaws and large teeth - are functionally and evolutionarily incompatible with each other. @mikemihalitsis.bsky.social and Peter Wainwright. Free to read: journals.plos.org/plosbiology/...

Excited to share our new preprint, Tooth development in frogs: Implications for the re-evolution of lost mandibular teeth and the origin of a morphological innovation doi.org/10.1101/2025...

Delighted to see our preprint on the developmental basis of vole molar evolution featured in such good company! Thank you for the shoutout 🙏 www.biorxiv.org/content/10.1...

Happy #FossilFriday! Our latest preprint combines fossils & lab experiments to uncover a simple developmental driver behind the evolution of complex molars in arvicoline rodents, your voles, lemmings, muskrats and other adorable fluff balls 🐭🦷✨ www.biorxiv.org/content/10.1...