Didelphodon (from Didelph[is] "opossum" and ὀδών odōn "tooth") is a genus of extinct metatherian mammal from the Late Cretaceous of North America.
Metatheria is a mammalian clade that includes all mammals more closely related to marsupials than to placentals. First proposed by Thomas Henry Huxley in 1880, it is a more inclusive group than the marsupials; it contains all marsupials as well as...
Marsupials are a diverse group of mammals belonging to the infraclass Marsupialia. They are natively found in Australasia, Wallacea, and the Americas. One of marsupials' unique features is their reproductive strategy: the young are born in a...
The Horseshoe Canyon Formation is a stratigraphic unit of the Western Canada Sedimentary Basin in southwestern Alberta. It takes its name from Horseshoe Canyon, an area of badlands near Drumheller. The Horseshoe Canyon Formation is part of the...
Stagodontidae is an extinct family of carnivorous metatherian mammals that inhabited North America and Europe during the late Cretaceous, and possibly to the Eocene in South America.
Pachyrhinosaurus (from Ancient Greek παχύς (pachys), thick; ῥίς (rhis), nose; and σαυρος (sauros), lizard) is a genus of centrosaurine ceratopsid dinosaur from the Late Cretaceous period of North America. The first examples were discovered by...
Polydolopimorphia is an extinct order of metatherians, closely related to extant marsupials. Known from the Paleocene–Pliocene of South America and the Eocene of Antarctica, they were a diverse group during the Paleogene, filling many niches, before...
Triceratops ( try-SERR-ə-tops; lit. 'three-horned face') is a genus of chasmosaurine ceratopsian dinosaur that lived during the late Maastrichtian age of the Late Cretaceous period, about 69 to 66 million years ago on the island continent of...
Pucadelphys is an extinct genus of non-marsupial metatherian (or possibly crown group Marsupial.). The genus is monotypic and contains the single species P. andinus. Fossils of Pucadelphys have been found in the Santa Lucía Formation in Tiupampa in...
The Mesozoic Era is an era of Earth's geological history, lasting from about 252 to 66 million years ago (Ma), comprising the Triassic, Jurassic and Cretaceous Periods. It is characterized by the dominance of archosaurian reptiles such as the...