Gabriel A. Martínez-Ruiz

Hadrosaurine braincase. #fossilfriday. Collected by Badlands #Dinosaur Museum, Jul 2025 & cleaned by Deanna. Associated skeleton from BLM-administered US #publiclands. Dinosaur Park Formation, Montana.

You're looking up into the underside of the skull roof. The bottom of the photo is the frontals.

#ZAVACEPHALE IS FINALLY OUT! 🥳 Our first definitive Early Cretaceous pachycephalosaur! (~15 my older than the previous oldest pachycephalosaurs) And the first hand material for the clade! I can't tell y'all how much of a pleasure it was to review this paper! ☺️

The first dinosaur eggshells from the Lance Formation. As for its identity, it could come from anything from Edmontosaurus to T. rex.
www.app.pan.pl/article/item...

Dinosaur extinction can explain continental facies shifts at the Cretaceous-Paleogene boundary - Communications Earth & Environment Dinosaurs promoted open habitats in the Late Cretaceous, and their extinction could have led to a radical reorganization of the landscape and ecosystem structure at the beginning of the Paleogene, acc...

Out today in @commsearth.nature.com from some of my newest colleagues at UMMP: evidence that the extinction of dinosaurs led to fundamental shifts in terrestrial environments, and that this signal is recorded in facies shifts tied to the K-Pg boundary: www.nature.com/articles/s43...

A domed pachycephalosaur from the early Cretaceous of Mongolia - Nature The pachycephalosaurian Zavacephale rinpoche, from the Early Cretaceous of Mongolia, provides crucial insights into the early evolution of dome-headed dinosaurs, including the development of the front...

Chinzorig, T., Takasaki, R., Yoshida, J. et al. A domed pachycephalosaur from the early Cretaceous of Mongolia. Nature (2025). doi.org/10.1038/s415...

3D model of a mosasaurus. It’s mostly blue with a few orange markings around the eye

Mosasaurus 3D model. Sculpted in ZBrush, textured in Substance 3D Painter and rendered in Blender.
#paleoart #paleontology #3dart #mosasaurus

Prehistoric Planet Ice Age image showing two homotheres interacting in a snowy landscape.

Prehistoric Planet Ice Age image showing two Woolly rhino, a calf and old adult.

Prehistoric Planet Ice Age image showing a glyptodont.

Prehistoric Planet Ice Age image showing a mother sloth climbing up a rocky surface, baby on her back.

It's true, #PrehistoricPlanet Ice Age is coming to #AppleTV for November 2025. These images show how good our animals are, but... believe me, this barely scratches the surface!! It has been a massive thrill and privilege to help bring this series together... you're in for an incredible treat.

Illustration of three species of aetosaurs. Top: Aetosaurus ferratus, middle: Scutarx deltatylus and bottom: Desmatosuchus spuriensis

Reconstruction of two species of Aetosaurs. Top: Typothorax coccinarum. Bottom: Paratypothorax andressorum

Why is my book taking so long to finish? Well, one of many reasons are Aetosaurs! They are very complicated to reconstruct AND my book has a lot of them! 😅 But Aetosaurs are awesome!

Aetosaurs are pseudosuchians, and thus related to modern crocodilians

#paleoart #aetosaurs #art

A portrait of a bull Arrhinoceratops as seen in Walking with Dinosaurs 2025.

I think I'll start sharing various artwork I did during the production of WWD - I was planning on doing a portrait of each animal but never had the time. I think I maybe made 3 or 4 in the end. Here's the first one I did, Arrhinoceratops.

#sciart #paleoart

Portrait of Torvosaurus as seen on Walking with Dinosaurs 2025.

Another bit of personal art I did during the production of Walking with Dinosaurs - Torvosaurus.

0 for life sciences

Result from the Dinosaur Park Formation #paleostream! This formation was on the wheel from the start and I anticipated and dreaded it at the same time. As one of the most famous dinosaur bearing formations this piece offered several challenges.

Tomorrow, Americans

Osteology and histology of a Plateosaurus trossingensis (Dinosauria: Sauropodomorpha) from the Upper Triassic of Switzerland with an advanced chronic pathology - Swiss Journal of Palaeontology The sauropodomorph Plateosaurus is one of the best-known dinosaurs from Europe due to the large numbers of articulated skeletons discovered from bonebed horizons in Switzerland and Germany. Plateosaur...

🚨New paper alert! 🚨

We describe a Plateosaurus skeleton 🦕 from Frick, northern Switzerland, suffering from a VERY diseased forearm!

Open Access: sjpp.springeropen.com/articles/10.... (1/n)

A new Mongolian tyrannosauroid and the evolution of Eutyrannosauria - Nature A new tyrannosauroid, Khankhuuluu mongoliensis gen. et sp. nov., from lower Upper Cretaceous deposits of Mongolia provides a new perspective on eutyrannosaurian origins and evolution.

The Perle (1977) "Alectrosaurus" material is FINALLY described!!

Voris, J.T., Zelenitsky, D.K., Kobayashi, Y. et al. A new Mongolian tyrannosauroid and the evolution of Eutyrannosauria. Nature (2025). doi.org/10.1038/s415...

Fossilized gut contents elucidate the feeding habits of sauropod dinosaurs Poropat et al. report the first sauropod gut contents found worldwide in a specimen of Diamantinasaurus from the Cretaceous of Australia. These fully support previous hypotheses of sauropod herbivory ...

Fossilized gut contents elucidate the feeding habits of sauropod dinosaurs: Current Biology www.cell.com/current-biol...

King Tyrant - a book - now has a trailer - like a movie! I had no idea this was coming, hats off to @princetonupress.bsky.social for putting it together!

"It's... pink" says Guybrush Pthreepwood, a large pterosaur walking along a rocky trail overlooking a coastal plain and sea. The sky beyond is yellowish, but Guybrush is right: that's a super pink set of clouds. Undeterred, he walks on, continuing his quest for the Ultimate Insult. He hopes Murray the Skull is some sort of cool dinosaur skull in this universe.

Realising that #FossilFriday is sneaking away, so I'll quickly post some #paleoart of the giant #pterosaur Hatzegopteryx to avoid missing out. I painted this back in 2019 but gave it a 30-minute spruce up today to sort out some compositional and colour issues. #sciart #fossil

Overabundance of abelisaurid teeth in the Açu Formation (Albian-Cenomanian), Potiguar Basin, Northeastern Brazil: morphometric, cladistic and machine learning approaches The Açu Formation (Albian-Cenomanian), Potiguar Basin, Northeastern Brazil, has yielded a great variety of fossil terrestrial vertebrates, with theropod dinosaurs standing out as one of the most di...

Overabundance of abelisaurid teeth in the Açu Formation (Albian-Cenomanian), Potiguar Basin, Northeastern Brazil: morphometric, cladistic and machine learning approaches: Journal of Vertebrate Paleontology: Vol 0, No 0 - Get Access www.tandfonline.com/doi/full/10....

“Here be Dragons”: Shed Teeth Potentially Indicate the Presence of Multiple Unidentified Allosauroids from the Early Cretaceous Cedar Mountain Formation of Utah Allosauroids were apex predators in many terrestrial ecosystems from the Early to early Late Cretaceous. Despite this, the only formally described allosauroid taxa from Cretaceous North America are Acrocanthosaurus of the Antlers Formation of Oklahoma, and the highly fragmentary Siats from the Cedar Mountain Formation of Utah. This lack of known allosauroids is especially apparent in the Yellow Cat Member of the Cedar Mountain Formation, based on the rarity of reported bones and absence of named taxa. However, their presence has previously been inferred by shed teeth from the lower portion of the Yellow Cat. Here we report on likely allosauroid teeth from three localities, Grayash, Blane II, and Doelling′s Bowl, in the Yellow Cat Member of the Cedar Mountain Formation, the former two localities being in the upper portion of the Yellow Cat which until now has not produced any allosauroid remains, at least not any reported in scientific literature. We also assess teeth tentatively identified as Acrocanthosaurus from the Long Walk Quarry in the Ruby Ranch Member of the Cedar Mountain Formation, and the Sonorasaurus Quarry in the Turney Ranch Formation of Arizona. Principal component analysis of linear and geometric morphometrics supports these teeth as being from allosauroids and specifically within Carcharodontosauria, making the Yellow Cat teeth the earliest reported evidence of carcharodontosaurs in North America. Furthermore, their co-occurrence with Utahraptor confirms that multiple large predators lived in this environment and suggests that North American allosauroids did not yield the entire predatory niche to other theropods until their extinction in the Cenomanian-Turonian ages. Lastly, the teeth from the different Yellow Cat Member localities appear morphometrically distinct from each other, suggesting that each may represent a different taxon, though small sample size prohibits a definitive statement on this. While the Arizona Acrocanthosaurus tooth may belong to a species of Acrocanthosaurus, the Long Walk teeth differ from Acrocanthosaurus atokensis in having significantly lower denticle density, and may represent a new taxon. We conclude that there may be as many as four carcharodontosaurid theropod taxa in the Cedar Mountain Formation, thus, the diversity of allosauroids in Early Cretaceous North America is likely greater than previously recognized.

T. Oswald et al. "“Here be Dragons”: Shed Teeth Potentially Indicate the Presence of Multiple Unidentified Allosauroids from the Early Cretaceous Cedar Mountain Formation of Utah," Journal of the Arizona-Nevada Academy of Science 50(2), 55-129, (4 June 2025). doi.org/10.2181/036....

It's mating season, and two enormous Dacentrurus males are fighting for access to the group of females. In their previous display of strength, neither of them has retreated, so they move on to the next phase, a physical fight in which they try to knock their opponent down by shoving

#paleoart

My 25 years of palaeoart chronology...

A 2023 illustration of a #Tyrannosaurus taking a bite out of an #Edmontosaurus tail, from DINOSAUR BEHAVIOUR, by Prof Michael Benton (@princetonupress.bsky.social).

#SciArt #PaleoArt #Dinosaurs #Trex #TyrannosaurusRex #JurassicPark #JurassicWorld #WildlifeArt

Cranial osteology of a new specimen of Allosaurus Marsh, 1877 (Theropoda: Allosauridae) from the Upper Jurassic of Portugal and a specimen-level phylogenetic analysis of Allosaurus url:https://academic.oup.com/zoolinnean/article-abstract/204/1/zlaf029/8151024

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...

Haridy, Y., Norris, S.C.P., Fabbri, M. et al. The origin of vertebrate teeth and evolution of sensory exoskeletons. Nature (2025). doi.org/10.1038/s415...

Teeth first evolved as sensory tissue in the armored exoskeletons of ancient fish, fossil scans find Anyone who has ever squirmed through a dental cleaning can tell you how sensitive teeth can be. This sensitivity gives important feedback about temperature, pressure—and yes, pain—as we bite and chew ...

New paper from the lab: Our teeth arose as sensory organs on the outside of the body of ancient jawless fish.!! Congrats to Yara Haridy and the team!
Background and video: phys.org/news/2025-05...
Open Access Paper: www.nature.com/articles/s41...
News and Views: www.nature.com/articles/d41...

Our report on employment is out in Paleobiology
(They did let us append that the paper was accepted before the election/changes to NSF and other granting agencies)

Employment in paleontology: status and trends in the United States | Paleobiology | Cambridge Core - www.cambridge.org/core/journal...

An epic paleoart piece of a Saurolophus staring down at a Tarbosaurus skull trampled by its herd members.

Art by Davide Bonadonna.

Walking with Dinosaurs BBC release date confirmed – 25 years after groundbreaking first series With new cutting-edge science, experts can reveal how the dinosaurs lived, hunted, fought and died more accurately than ever before.

It's confirmed! Walking with Dinosaurs will air on BBC One and iPlayer from 6:25pm BST on Sunday the 25th of May!
www.radiotimes.com/tv/documenta...

Diagram of the skeleton of a small, two-legged dinosaur, with close-up photos of gut contents preserved in its body cavity.

Chemical analysis of gut contents preserved in the alvarezsaurian dinosaur Bannykus suggests that it fed on vertebrates: www.the-innovation.org/article/doi/... 🧪 (📷Wang et al.)

Earliest amniote tracks recalibrate the timeline of tetrapod evolution - Nature Analysis of a fossil trackway from the earliest Carboniferous of Australia shows prints of toes with claws, suggesting that the origin of amniotes was at least 35–40 million years earlier than pr...

Long, J.A., Niedźwiedzki, G., Garvey, J. et al. Earliest amniote tracks recalibrate the timeline of tetrapod evolution. Nature (2025). doi.org/10.1038/s415...