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The only recorded find of a dinosaur fossil in Central America consists of a single femur discovered from Middle Cretaceous age deposits in Comayagua Department in the central part of Honduras. The fossil had been found in January, 1971 by Bruce Simonson and Gregory Horne, though it was later sent to the National Museum of Natural History, USA ...
The specimen was collected in 1858 from the Woodbury Formation in New Jersey, US, representing the first dinosaur species known from more than isolated teeth to be identified in North America. Using radiometric dating of bivalve shells from the same formation, the sedimentary rocks where the Hadrosaurus fossil was found have been dated at some ...
S. armatus is both the first Stegosaurus to be discovered and the type species. [42] Its type specimen is poorly preserved, incomplete, and lacks diagnostic features. [41] It has been considered dubious, with S. stenops as the neotype species for the genus. [41] S. stenops [14] Colorado, Utah and Wyoming, Brushy Basin member [16] [14] [9] [43]
Possible teeth found in Maryland. Diplotomodon: Upper Cretaceous: carnivore: Dubious name for a species of tyrannosauroid from New Jersey, possibly a Dryptosaurus or a potentially new genus. Dryptosaurus: Upper Cretaceous: carnivore: Medium-sized tyrannosauroid from New Jersey. It was the first theropod unearthed in North America. Eotrachodon ...
Discovered in October 1855, T. formosus was among the first dinosaurs found in North America, although it was thought to be a lizard until 1877. Several well-known troodontid specimens from the Dinosaur Park Formation in Alberta were once believed to be members of this genus.
Apatosaurus (/ ə ˌ p æ t ə ˈ s ɔːr ə s /; [3] [4] meaning "deceptive lizard") is a genus of herbivorous sauropod dinosaur that lived in North America during the Late Jurassic period. Othniel Charles Marsh described and named the first-known species, A. ajax, in 1877, and a second species, A. louisae, was discovered and named by William ...
The closest is the Dinosaur Genera List, compiled by biological nomenclature expert George Olshevsky, which was first published online in 1995 and was regularly updated until June 2021. [ 1 ] [ 2 ] The most authoritative general source in the field is the second (2004) edition of The Dinosauria .
A 2016 estimate put the number of dinosaur species living in the Mesozoic at 1,543–2,468, [24] [25] compared to the number of modern-day birds (avian dinosaurs) at 10,806 species. [26] Extinct dinosaurs, as well as modern birds, include genera that are herbivorous and others carnivorous, including seed-eaters, fish-eaters, insectivores, and ...