Découverte au Maroc de fossiles de dinosaures datant de 66 ...
Dans le bassin d'Ouled Abdoun, à Khouribga, deux fossiles de dinosaures datant d'environ 66 millions d'années et cousins du géant T. rex, ...
Sci.News
Des chercheurs ont fait une découverte majeure dans le bassin d’Ouled Abdoun. Il s’agit des fossiles de deux cousins du redoutable Tyrannosaurus rex (T. rex), rapporte <anchor>Sci.News</anchor>. D’après les experts derrière cette identification, la trouvaille «remet en question nos conceptions traditionnelles de la biodiversité des dinosaures à la fin du Crétacé», suggérant que ces derniers «prospéraient dans des régions jusqu’alors insoupçonnées.»
Fossils of Two New Abelisaurid Dinosaurs Uncovered in Morocco | Sci.News
Fossils of Two New Abelisaurid Dinosaurs Uncovered in Morocco \| Sci.News

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# Fossils of Two New Abelisaurid Dinosaurs Uncovered in Morocco

Aug 23, 2023 by [News Staff](https://www.sci.news/author/scinews)

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**Paleontologists have unearthed the fossilized remains of two _T. rex_ cousins in the Ouled Abdoun Basin, northern Morocco.**

[![Fossils have been found of several types of abelisaur showing the diversity of dinosaurs in Morocco at the end of the Cretaceous period. Image credit: Andrey Atuchin.](https://cdn.sci.news/images/2023/08/image_12207-Moroccan-Abelisaurids.jpg)](https://cdn.sci.news/images/enlarge11/image_12207e-Moroccan-Abelisaurids.jpg)

Fossils have been found of several types of abelisaur showing the diversity of dinosaurs in Morocco at the end of the Cretaceous period. Image credit: Andrey Atuchin.

The two new dinosaur species lived approximately 66 million years ago and had short, bulldog snouts and very short arms.

They belonged to [Abelisauridae](https://dinopedia.fandom.com/wiki/Abelisauridae), a family of carnivorous dinosaurs that were counterparts to the tyrannosaurs of the northern hemisphere.

One of the species was about 2.5 m (8 feet) long and is represented by a fossilized foot bone found near the town of Sidi Daoui.

The other, from nearby Sidi Chennane, measured around 5 m (15 feet) in length and is represented by a shin bone.

“What’s surprising here is that these are marine beds,” said University of Bath paleontologist Nick Longrich.

“It’s a shallow, tropical sea full of plesiosaurs, mosasaurs, and sharks. It’s not exactly a place you’d expect to find a lot of dinosaurs. But we’re finding them.”

The fossils suggest as many as three abelisaurid species [coexisted](https://www.sci.news/paleontology/kem-kem-predators-08367.html) in Morocco around 66 million years ago, showing dinosaurs were highly diverse in North Africa prior to the end-Cretaceous mass extinction.

“The end of the Cretaceous in western North America definitely seems to become less diverse at the end,” Dr. Longrich said.

“But that’s just one small part of the world. It’s not clear that you can generalise from the dinosaurs of Wyoming and Montana to the whole world.”

“It also grew colder near the end, so it might not be surprising if dinosaurs at higher latitudes became less diverse. But we don’t know much about dinosaurs from lower latitudes.”

“In Morocco at least, they seem to have remained diverse and successful up until the end.”

“When _T. rex_ reigned as a megapredator in North America, abelisaurs sat at the top of the food chains in North Africa,” said Professor Nour-Eddine Jalil, a paleontologist at the Natural History Museum and at the Universite Cadi Ayyad.

“The dinosaur remains, despite their rarity, give the same messages as the more abundant marine reptile remains.”

“They tell us that, just before the Cretaceous-Paleogene crisis, biodiversity was not declining but on the contrary, was diverse.”

The team’s [paper](https://www.sciencedirect.com/science/article/abs/pii/S0195667123002057) was published in the journal _Cretaceous Research_.

\\_\\_\\_\_\_

Nicholas R. Longrich _et al_. New fossils of Abelisauridae (Dinosauria: Theropoda) from the upper Maastrichtian of Morocco, North Africa. _Cretaceous Research_, published online August 22, 2023; doi: 10.1016/j.cretres.2023.105677

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[Abelisauridae](https://www.sci.news/tag/abelisauridae) [Africa](https://www.sci.news/tag/africa) [Bone](https://www.sci.news/tag/bone) [Cretaceous](https://www.sci.news/tag/cretaceous) [Dinosaur](https://www.sci.news/tag/dinosaur) [end-Cretaceous extinction](https://www.sci.news/tag/end-cretaceous-extinction) [Fossil](https://www.sci.news/tag/fossil) [Morocco](https://www.sci.news/tag/morocco) [Theropod](https://www.sci.news/tag/theropod)

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Planetary Science

[![Illustration of a human hand as it might appear if the new tissue transparency effect proves effective in humans. Currently, the effect has only been tested with animals in a laboratory setting. Note that dyes may be harmful. Always exercise caution with dyes and do not consume directly, apply to people or animals, or otherwise misuse. Image credit: Keyi ‘Onyx’ Li / U.S. National Science Foundation.](https://cdn.sci.news/images/2024/09/image_13237f-Tartrazine-50x50.jpg)](https://www.sci.news/biology/tartrazine-13237.html "Common Food Dye Makes Skin, Muscle Reversibly Transparent in Live Animals")

## [Common Food Dye Makes Skin, Muscle Reversibly Transparent in Live Animals](https://www.sci.news/biology/tartrazine-13237.html "Common Food Dye Makes Skin, Muscle Reversibly Transparent in Live Animals")

Sep 5, 2024 \|
Biology

[![Life reconstruction of Sasayamagnomus saegusai. Image credit: Kanon Tanaka.](https://cdn.sci.news/images/2024/09/image_13236-Sasayamagnomus-saegusai-50x50.jpg)](https://www.sci.news/paleontology/sasayamagnomus-saegusai-13236.html "New Ceratopsian Dinosaur Species Unveiled")

## [New Ceratopsian Dinosaur Species Unveiled](https://www.sci.news/paleontology/sasayamagnomus-saegusai-13236.html "New Ceratopsian Dinosaur Species Unveiled")

Sep 5, 2024 \|
Paleontology

[![The galaxy cluster MACS-J0417.5-1154 is so massive it is warping the fabric of space-time and distorting the appearance of galaxies behind it, an effect known as gravitational lensing. This natural phenomenon magnifies distant galaxies and can also make them appear in an image multiple times, as Webb saw here. Two distant, interacting galaxies -- a face-on spiral and a dusty red galaxy seen from the side -- appear multiple times, tracing a familiar shape across the sky. Active star formation, and the face-on galaxy’s remarkably intact spiral shape, indicate that these galaxies’ interaction is just beginning. Image credit: NASA / ESA / CSA / STScI / V. Estrada-Carpenter, Saint Mary’s University.](https://cdn.sci.news/images/2024/09/image_13235-Cosmic-Question-Mark-50x50.jpg)](https://www.sci.news/astronomy/webb-cosmic-question-mark-13235.html "Webb Spots Distorted Galaxy Forming Cosmic Question Mark")

## [Webb Spots Distorted Galaxy Forming Cosmic Question Mark](https://www.sci.news/astronomy/webb-cosmic-question-mark-13235.html "Webb Spots Distorted Galaxy Forming Cosmic Question Mark")

Sep 5, 2024 \|
Astronomy

[![Oceanic anoxic events are geologically abrupt phases of extreme oxygen depletion in the oceans that disrupted marine ecosystems and brought about evolutionary turnover. Typically lasting approximately 1.5 million years, these events occurred frequently during the Mesozoic era, from about 183 to 85 million years ago. One hypothesis suggests that anoxic events resulted from enhanced chemical weathering of Earth’s surface in a greenhouse world shaped by high volcanic carbon outgassing. Gernon et al. tested this hypothesis using a combination of plate reconstructions, tectonic-geochemical analysis and global biogeochemical modeling. Image credit: University of Southampton.](https://cdn.sci.news/images/2024/09/image_13234-Mesozoic-Earth-50x50.jpg)](https://www.sci.news/paleontology/mesozoic-oceanic-anoxic-events-13234.html "Study: Tag-Team between Oceans and Continents Triggered Mesozoic Extinctions of Marine Life")

## [Study: Tag-Team between Oceans and Continents Triggered Mesozoic Extinctions of Marine Life](https://www.sci.news/paleontology/mesozoic-oceanic-anoxic-events-13234.html "Study: Tag-Team between Oceans and Continents Triggered Mesozoic Extinctions of Marine Life")

Sep 4, 2024 \|
Geoscience

[![An artist’s reconstruction of Qunkasaura pintiquiniestra. Image credit: José Antonio Peñas Artero.](https://cdn.sci.news/images/2024/09/image_13233-Qunkasaura-pintiquiniestra-50x50.jpg)](https://www.sci.news/paleontology/qunkasaura-pintiquiniestra-13233.html "Paleontologists Discover New Species of Titanosaur in Spain")

## [Paleontologists Discover New Species of Titanosaur in Spain](https://www.sci.news/paleontology/qunkasaura-pintiquiniestra-13233.html "Paleontologists Discover New Species of Titanosaur in Spain")

Sep 4, 2024 \|
Paleontology

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