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#mosasaur

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Alberta Palaeo Society

Alberta may be landlocked now, but in the Late Cretaceous it lay beneath the Western Interior Seaway and was home to massive marine reptiles like mosasaurs! How did so many predators coexist?

New research led by Dr. Femke Holwerda shows niche partitioning using tooth wear, biomechanics, and isotopes with unprecedented detail.

Open-access paper: mdpi.com/1424-2818/17/3/205
Paleo 2023 talk: youtube.com/watch?v=FiLhIornWI

A map of North America during the cretaceous, with the outline of Alberta highlighted in red. It's clear what the very western part of the province is above water, but the rest is covered by the Western Interior Seaway.
Fossils of a Progrnathodon skull and the skull & body of a Mosasaurus.
A close-up of the teeth of a mosasaur, demonstrating both coarse scratches, fine scratches, and pits.
A graph showing the areas within which the isotope ratios of the different mosasaurs (and some fish) lie. In general there are two clusters (one in the bottom and one in the top) and a large overlapping area (Mosasaurus missouriensis).
#palaeontology#paleontology#mosasaur
Public
Bob Nicholls Art

My 25 years of palaeoart chronology...

Yesterday's hunter becomes the prey. Here's the mosasaur half of my large Western Interior Seaway mural (2021) for Children's Museum of Indianapolis, USA. Featured are a group of Platecarpus fleeing a Tylosaurus, Apsopelix fish, and a variety of ammonites.

#Art#Painting#PaleoArt
Public
Lukas VFN 🇪🇺

New #Mosasaur Species from Morocco Had Dagger-Like, Interlocking Teeth
sci.news/paleontology/khinjari

A bizarre new plioplatecarpine mosasaurid from the #Maastrichtian of #Morocco sciencedirect.com/science/arti

"Some #mosasaurs had teeth to pierce prey, others to cut, tear, or crush. Now we have #Khinjaria acuta, with a short face full of huge, dagger-shaped teeth."

Artist reconstruction of Khinjaria acuta under water hunting fish
Public
Lukas VFN 🇪🇺

#Cretaceous-Period #Mosasaur Had Enormous, Wing-Shaped Flippers
sci.news/paleontology/megapter

A new derived mosasaurine (#Squamata: Mosasaurinae) from south-western Japan reveals unexpected postcranial diversity among hydropedal mosasaurs tandfonline.com/doi/full/10.10

"Its extra-long rear flippers might have aided propulsion in concert with its long finned tail. And unlike other #mosasaurs, it had a dorsal fin like a #shark’s that would have helped it turn quickly and with precision in the water."

Reconstruction of the newly described mosasaur.
Public
Lukas VFN 🇪🇺

#NewSpecies of #Mosasaur Identified in Mexico
sci.news/paleontology/yaguaras

A new species of #Yaguarasaurus (#Mosasauridae: Plioplatecarpinae) from the Agua Nueva Formation (Upper #Turonian – Lower #Coniacian) of Nuevo Leon, #Mexico sciencedirect.com/science/arti

"this #marine #reptile had a long, slender rostrum and #jaws with small #teeth. The ancient #creature was roughly 5.2 m (17 feet) in length, making it one of the earliest known large #mosasaurs."

Life reconstruction of Yaguarasaurus regiomontanus, an exyinct sea reptile with a long lizard-like head. By Luis Rey.
Public
Lukas VFN 🇪🇺

Signs of wear on #mosasaurs' teeth show they were picky eaters who liked #seafood phys.org/news/2023-11-mosasaur

3D dental microwear in type-#Maastrichtian #mosasaur teeth: Femke M. Holwerda et al. nature.com/articles/s41598-023

"#Prognathodon in particular, with its large cone-shaped teeth, appears to have had a surprising amount of #shellfish in its diet... #Plioplatecarpus, with narrow pointed teeth, showed a striking number of signs of wear. Perhaps it was also fond of #fish with strongly scaled bodies"

(a) Map: area in the southeast Netherlands and northeast Belgium with the most important quarries indicated (b) five mosasaur taxa - shown in simple outlines and with photos of their fossil teeth
Public
Lukas VFN 🇪🇺

New species of #mosasaur named for Norse #SeaSerpent phys.org/news/2023-10-species-

#Jormungandr walhallaensis : a new mosasaurine from the Pierre Shale Formation (Middle #Campanian) of North Dakota digitallibrary.amnh.org/items/

"The specimen is estimated to be about 24 feet (7.3m) long, and in addition to flippers and a shark-like tail, it would have had 'angry eyebrows' caused by a bony ridge on the skull, and a slightly stumpy tail that would have been shorter than its body."

A reconstruction of two Jormungandr walhallaensis mosasaurs fighting. By Henry Sharpe
#Cretaceous#mosasaurs
Public
Lukas VFN 🇪🇺

#NewSpecies of #Mosasaur Identified in #Utah sci.news/paleontology/sarabosa

A new lower #Turonian #mosasaurid from the #WesternInteriorSeaway and the antiquity of the unique basicranial circulation pattern in Plioplatecarpinae sciencedirect.com/science/arti

"#Mosasaurs were a group of large predatory marine #reptiles that inhabited all of the world’s oceans during the Late #Cretaceous epoch, between 90 and 66 million years ago. These creatures went #extinct during the end-Cretaceous #extinction."

Life reconstruction of the mosasaur Plioplatecarpus, a distant relative of Sarabosaurus dahli.
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