Medusaceratops

Medusaceratops is an extinct genus of centrosaurine ceratopsian dinosaur known from the Late Cretaceous Judith River Formation (middle Campanian stage) of Montana, northern United States. It contains a single species, Medusaceratops lokii. The known material of Medusaceratops came from a bonebed in the badlands on the west side of Kennedy Coulee adjacent to the Milk River, in the Milk River Natural Area, near Havre, Hill County of Montana. The material was first reported by Sweeney and Boyden (1993), who considered it to represent the southernmost occurrence of Styracosaurus albertensis, based on misidentified frill spikes. Trexler and Sweeney (1995) reinterpreted the spikes as eye-socket horncores and noted their similarity to those of the nomen dubium Ceratops montanus from a nearby area, however, could not refer the bonebed material to any valid existing taxon. The bonebed, known as the Mansfield Bonebed honoring its landowner, is located on private land and historically has been excavated by several commercial companies. The type material of Medusaceratops and other specimens were excavated more recently and have been purchased by the Wyoming Dinosaur Center from Canada Fossils, Ltd., of Calgary, Alberta. Additional material from the same excavation was purchased and accessioned by the Royal Tyrrell Museum of Palaeontology. Canada Fossils, Ltd., also assembled two composite skeletons using the Mansfield Bonebed material which are in the collections of the Wyoming Dinosaur Center and the Fukui Prefectural Dinosaur Museum, however neither of the casts has an exact reconstruction of Medusaceratops as it was later described. The name Medusaceratops was coined by Canadian paleontologist Michael J. Ryan of the Cleveland Museum of Natural History in 2003 in a dissertation. Its fossils were subsequently confused with those of Albertaceratops, another centrosaurine ceratopsian from Alberta which had been described by Ryan in 2007. Later, Ryan realized that the Mansfield Bonebed fossils did not belong to Albertaceratops.

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Concepts associés (8)

Diabloceratops

Diabloceratops est un genre éteint de dinosaures herbivores appartenant au groupe des cératopsiens. Il a vécu durant le Crétacé supérieur (Campanien) il y a environ 79,9 millions d'années, dans ce qui est aujourd'hui l'Utah, aux États-Unis. L'espèce type et unique espèce, Diabloceratops eatoni, a été nommée et décrite en 2010 par et . Le nom du genre combine l'espagnol diablo (« diable »), une référence aux cornes sur le bouclier au cou, et l'élément ceratops (du grec (« corne ») et (« tête »), donc « tête à cornes »), courant dans les noms de cératopsiens.

Timeline of ceratopsian research

This timeline of ceratopsian research is a chronological listing of events in the history of paleontology focused on the ceratopsians, a group of herbivorous marginocephalian dinosaurs that evolved parrot-like beaks, bony frills, and, later, spectacular horns. The first scientifically documented ceratopsian fossils were described by Edward Drinker Cope starting in the ; however, the remains were poorly preserved and their true nature was not recognized. Over the next several decades, Cope named several such genera and species.

Pachyrhinosaurus

Pachyrhinosaurus, en français, pachyrhinosaure (« lézard au nez épais ») est un genre éteint de dinosaures ornithischiens qui a vécu aux États-Unis et au Canada vers la fin du Crétacé supérieur il y a entre 73 et 68 millions d’années. Trois espèces ont été identifiées. On sait que P. lakustai, de la formation de Wapiti, a existé d'il y a 73,5 à 72,5 millions d’années. P. canadensis est plus récent et est connu dans le membre inférieur de la formation de Horseshoe Canyon, il y a environ 71,5 à 71 millions d'années, ainsi que dans la formation de St.