Guillaume Houée 🦷🔬

🚨 Nouvel article faisant suite aux dernières campagnes de fouilles de #Rhinopolis et @cr2p.bsky.social à Franchesse (Allier, France), petit🧵:

sciencepress.mnhn.fr/en/periodiqu...

A phylogeny for Heterostraci (stem‐gnathostomes) The armoured jawless fishes (‘ostracoderms’) are major and widespread components of middle Palaeozoic ecosystems. As successive branches on the gnathostome stem lineage, they represent the early sequ...

A phylogeny for Heterostraci (stem-gnathostomes) onlinelibrary.wiley.com/doi/10.1002/... @datadryad @wileyearthspace @fossilrob.bsky.social @evopalaeo.bsky.social

Acquisition of neural crest promoted thyroid evolution from chordate endostyle Integration of neural crest cells into the endostyle developmental program promoted its evolution into the thyroid gland.

Excited to announce that our new paper is now published in Science Advances 🚀🧠 ‘Acquisition of neural crest promoted thyroid evolution from chordate endostyle’ — check it out here: www.science.org/doi/10.1126/...

Novel assembly of a head–trunk interface in the sister group of jawed vertebrates - Nature Imaging of a Devonian jawless fish reveals advanced features previously thought to be exclusive to jawed vertebrates, challenging the idea that jaws were the primary driver for the evolution of derived traits in the vertebrate body plan.

Nature research paper: Novel assembly of a head–trunk interface in the sister group of jawed vertebrates

go.nature.com/47lrjxX

New #GRAVIBONE paper from @camillebader.bsky.social with Rémy Gilardet, Nicolas Rinder, @johnrhutchinson.bsky.social & @toriherridge.bsky.social on the long bone microanatomy of elephants. Well done Camille :)
academic.oup.com/zoolinnean/a...

Campagne de fouilles septembre 2024b :
www.researchgate.net/publication/...

Campagne de fouilles septembre 2024a :
www.researchgate.net/publication/...

Event Organisers

An international symposium is coming next year:
18th International Symposium on Early and Lower Vertebrates
#paleontology 🦈🐟

📅 February 3-8, 2026
📍 Berrechid, Morocco
➡️ sites.google.com/view/iselv-1...

The origin of vertebrate teeth and evolution of sensory exoskeletons - Nature Re-examination of the presumed Cambrian fossil fish Anatolepis reveals previous misidentification of aglaspidid sensory structures as dentine, a vertebrate sensory tissue, showing it to be a...

Glad to share a new paper led by @yara_haridy and @NeilShubin Lab on the early evolution of teeth! Modern and fossil data point at an ancestrally sensorial function for the earliest dentine
www.nature.com/articles/s41...

Odontode microanatomy in the Middle-Ordovician agnathan vertebrates Eriptychius and Astraspis.

Wonderful power of exaptation! Sensory organs to feeding structures and weapons in vertebrates:
"patterns of convergence and innervation reveal that dentine evolved as a sensory tissue in the exoskeleton of early vertebrates"
www.nature.com/articles/s41...
🧪 ⚒️ #Paleobio #EvoBio #Geology

For specialists, I also made an additional figure (not included in the News & Views) that places Haridy et al.'s results in a broader context 🧐

The evolutionary origin of sensitive dental structures Fossil data shed light on a debate about when vertebrate dental tissues arose by assigning an early sensory structure to arthropods rather than to vertebrates.

Thrilled to have co-written a News & Views with P. Janvier on Haridy et al.’s recent Nature paper. They reveal that Anatolepis, once thought to have the oldest dental tissue, is actually Cambrian arthropod sensory armor!
Paper: nature.com/articles/s41...
N&V: www.nature.com/articles/d41...

The evolutionary origin of sensitive dental structures Fossil data shed light on a debate about when vertebrate dental tissues arose by assigning an early sensory structure to arthropods rather than to vertebrates.

Congrats to Yara and team! They reveal that Anatolepis - previously interpreted as the oldest vertebrate with a mineralised skeleton - is not a vertebrate at all!
Paper here: tinyurl.com/59sdw7x9
and a nice write up by @guillaumehouee.bsky.social & Philippe Janvier here: tinyurl.com/2u6haac8

Bone labeling experiments and intraskeletal growth patterns in captive leopard geckos (Eublepharis macularius) In this study, we used fluorochrome labels in captive leopard geckos (Eublepharis macularius) to track bone growth and intraskeletal variability from embryonic to adult growth stages. Overall, the ti...

New paper alert! This was a fun study examining intraskeletal growth patterns in leopard geckos using fluorescent labeling. Labels administered in ovo are still present up to 4 years post-hatching! doi.org/10.1111/joa....

A cut surface of a permineralized fossil femur embedded in clear epoxy

A permineralized #Dimetrodon femur ready for #ThinSectionThursday #Paleohistology

1/10 🚨🚨 New paper with @tjnear.bsky.social! Here, we revise the systematics of sturgeons using a phylogenetic approach! We confirm an Early Cretaceous origin for the sturgeon total clade and resurrect several genera for living species!

Ok first post here! Hi, I study fossil snakes 🐍 and also produce paleoart!... sometimes... 👀

Great to see our chicken wing image featured on the cover of @plosbiology.org 🐣🔬! To learn more about how these feathers develop, check out the full article here ⬇️🧪
journals.plos.org/plosbiology/...

@lanevol.bsky.social @genevunige.bsky.social

The genomic signatures of evolutionary stasis Abstract. Evolutionary stasis characterizes lineages that seldom speciate and show little phenotypic change over long stretches of geological time. Althoug

I am beyond honored to announce that our paper (academic.oup.com/evolut/artic...) revealing a molecular mechanism of evolutionary stasis has won the @sse-evolution.bsky.social President's Award

This work would have been impossible w/o my colleagues @tjnear.bsky.social lab and beyond!

PhD alert: Je cherche un candidat pour travailler sur l'évolution morphologique et fonctionnelle de la tête des squamates apodes. Le projet implique de la biologie évolutive, des expériences et simulations mécaniques et des bestioles à écailles! @mnhn.fr @mecadev.bsky.social
adum.fr/as/ed/voirpr...

CT scan of the head clasper (tenaculum) from the Spotted Ratfish (Hydrolagus colliei), compete with its rows of shark-like teeth!

Our paper features fossil reconstruction art (of Helodus simplex) by Ray Troll - https://www.trollart.com/

New Pre-Print Alert! "Teeth Outside the Jaw: Evolution and Development of the Toothed Head Clasper in Chimaeras." We use fossil evidence, development and CT scans through ghost shark ontogeny to describe the emergence of the tenaculum! 👻🦈🦷 @karlycohen.bsky.social
www.biorxiv.org/content/10.1...

Fig. 3Variation in enamel general morphology. Differences in enamel surface morphology with (A) corrugated enamel surface from Acrochordus javanicus (B) worn surface of Boiga cynodon, and crenellated surface of Eirenis decemlineatus (C); both enamel outer surface and DEJ (dentino-enamel junction) are highlight in yellow to emphasize the different enamel surface. Different enamel thickness from different snake teeth of different sizes with a small-sized tooth with a thick enamel layer in Liodytes rigida (D), a small-sized tooth with a thin enamel layer in Micrurus psyches (E), a large-sized tooth with a thin enamel layer in Boa constrictor (F), a medium-sized tooth with a medium thick enamel layer in Naja annulata (G). Fractured and detached enamel observed in Fordonia leucobalia in SEM and in CT longitudinal sections (H), and enamel layer observed on the anterior facet of a Clelia clelia tooth (I) compared to the enamel present in all tooth facets in Atractaspis engaddensis in the microscopic image and virtual section

ICB free read
Show Me Your #Teeth And I Will Tell You What You Eat: Differences in Tooth Enamel in #Snakes with Different Diets

by Dumont, Milgram, Herrel, Shahar, Shacham, Houssin, Delapré, Cornette, @marionsegall.bsky.social

doi.org/10.1093/icb/...

#morphology #ecology #science #biology

Magnifique paléoart de ‪@spinojp.bsky.social‬ proposant une première représentation du paléoenvironnement du Permien de Franchesse !

Ouverture de la campagne #Permien 2024 ! ⛏️
Le dégagement de la surface de fouille a déjà permis de retrouver nos premiers seymouriamorphes 🦎 et aeduellides 🐟

🚨 Nouvel article sur les rhinocéros éponymes de Gannat ! @manonhullot.bsky.social, membre de l’association, nous présente la paléoécologie des rhinocéros européens lors de la transition Oligocène-Miocène 🦏 (petit🧵) :

Three Discosauriscus sp. are swimming around a horserail-like plant

Smoll #paleoart of #Permian life from the lagerstätte of Franchesse, in central France🇨🇵, depicting 🦎Discosauriscus vibing in shallow waters (see #fossils below⬇️)

Arrivée de 🦏 #Rhinopolis sur Twitter ! Retrouvez ici nos comptes rendus de fouilles des années précédentes 🧵 :

Quantifying the configurational complexity of biological systems in multivariate ‘complexity space’ | Journal of The Royal Society Interface An increasing number of evolutionary studies seek to quantify the morphological complexity of organisms, particularly those comprising serially homologous elements at different hierarchical levels of ...

royalsocietypublishing.org/doi/10.1098/...
This looks right up my street, can't wait to read!

論文が出ました。白亜紀中頃の獣脚類恐竜の走行適応についてを調べた内容です。

Our new paper is out: on the temporal pattern of the cursorial trait, arctometatarsalian pes, in theropod evolution. Check out the paper here: royalsocietypublishing.org/doi/10.1098/...

Ancient fish fossil suggests ‘living skeletons’ evolved 460 million years ago X-ray analysis of bony scale shows vertebrates developed ability to remodel and repair bone much earlier than thought

Great to see old pals and new results at #SICB2025, including Yara Haridy's deep dive into some of the earliest bony skeletons: www.science.org/content/arti...