Praefectus

Vertebrate paleontologist studying mosasaurid squamates from Morocco. I post pictures of fossils.

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Mosasaur

(PDF) Select Specimens from the Mosasaur Collections at the University of Colorado Boulder

PDF | Routine maintenance and re-housing of the paleontological collections at the University of Colorado Museum of Natural History (UCM) pe

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(PDF) Select Specimens from the Mosasaur Collections at the University of Colorado Boulder

PDF | Routine maintenance and re-housing of the paleontological collections at the University of Colorado Museum of Natural History (UCM) pe

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(PDF) Select Specimens from the Mosasaur Collections at the University of Colorado Boulder

PDF | Routine maintenance and re-housing of the paleontological collections at the University of Colorado Museum of Natural History (UCM) pe

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Prognathodon solvayi

(PDF) On the supposed presence of Prognathodon solvayi in the Demopolis Chalk

PDF | While reporting on the mosasaurid fauna of the upper Demopolis Chalk of western Alabama and northeastern Mississippi, Derstler (1988)

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Prognathodon solvayi by Carlos Espinosa

(PDF) On the supposed presence of Prognathodon solvayi in the Demopolis Chalk

PDF | While reporting on the mosasaurid fauna of the upper Demopolis Chalk of western Alabama and northeastern Mississippi, Derstler (1988)

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https://porphyrogennetos.substack.com/p/dvgs-2025

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80 million-year-old sea monster jaws filled with giant globular teeth for crushing prey discovered in Texas

Rare fossils of the mosasaur Globidens alabamaensis — a 20 foot predator with strange, mushroom-shaped teeth — unearthed in northeastern Tex

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Eremiasaurus heterodontus jaw

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Halisaurine jaw

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Newly Identified ‘Hell Chicken’ Species Helps Explain Time of the Dinosaurs

The species tells researchers that dinosaurs weren’t sliding toward extinction before the fateful asteroid hit.

Were dinosaurs already on their way out when an asteroid hit Earth 66 million years ago, ending the Cretaceous, the geologic period that started about 145 million years ago? It’s a question that has vexed paleontologists like us for more than 40 years. In the late 1970s, debate began about whether dinosaurs were at their peak or in decline before their big extinction. Scientists at that time noted that while dinosaur diversity seemed to have increased in the geologic stage that spanned 83.6 million to 71.2 million years ago, the number of species on the scene seemed to decrease during the last few million years of the Cretaceous. Some researchers have interpreted this pattern to mean that the asteroid that struck the Gulf of Mexico was simply the final blow for an already vulnerable group of animals. However, others have argued that what looks like a decrease in the diversity of dinosaurs may be an artifact of how hard it is to accurately count them. Fossil formations might preserve different dinosaurs more or less often based on factors like their favored environment and how easily their bodies fossilized there. The accessibility of various outcrops could influence what kinds of fossils researchers have so far found. These biases are a problem because fossils are what paleontologists must rely on to conclusively answer how healthy dinosaur populations were when the asteroid hit...

Read more: https://www.discovermagazine.com/the-sciences/newly-identified-hell-chicken-species-helps-explain-time-of-the-dinosaurs

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Globidens

(PDF) New remains of the mosasaur Globidens alabamaensis from the North Sulphur River of Texas

PDF | Here, we report on the important discovery of two well-preserved maxillae from the durophagous mosasaur Globidens alabamaensis Gilmore

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Globidens

Globidens teeth

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Globidens tooth

(PDF) New remains of the mosasaur Globidens alabamaensis from the North Sulphur River of Texas

PDF | Here, we report on the important discovery of two well-preserved maxillae from the durophagous mosasaur Globidens alabamaensis Gilmore

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Globidens Jaws

(PDF) New remains of the mosasaur Globidens alabamaensis from the North Sulphur River of Texas

PDF | Here, we report on the important discovery of two well-preserved maxillae from the durophagous mosasaur Globidens alabamaensis Gilmore

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Prognathodon currii teeth

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Hemipristis tooth