Atrociraptor marshalli ("Marshall's cruel thief") is a dromaeosaurid dinosaur species from the Upper Cretaceous (Upper Maastrichtian) of Alberta, Canada. The type (and only) specimen was discovered in the Horseshoe Canyon Formation, near Drumheller, Alberta. It had a relatively short, massive skull with slender lower jaws and long, highly curved teeth (the rest of the skeleton is unknown). Similar teeth are found in the Upper Cretaceous Lance Formation. Atrociraptor seems to be most similar to Deinonychus. Scientific classification or biological classification is how biologists group and categorize extinct and living species of organisms. ... Phyla Porifera (sponges) Ctenophora (comb jellies) Cnidaria Placozoa Subregnum Bilateria  Acoelomorpha  Orthonectida  Rhombozoa  Myxozoa  Superphylum Deuterostomia     Chordata (vertebrates, etc. ... Typical Classes Subphylum Urochordata - Tunicates Ascideiacea Thaliacea Larvacea Subphylum Cephalochordata - Lancelets Subphylum Myxini - Hagfishes Subphylum Vertebrata - Vertebrates Petromyzontida - Lampreys Placodermi (extinct) Chondrichthyes - Cartilaginous fishes Acanthodii (extinct) Actinopterygii - Ray-finned fishes Actinistia - Coelacanths Dipnoi - Lungfishes Amphibia - Amphibians Reptilia - Reptiles Aves - Birds Mammalia - Mammals Chordates (phylum Chordata) include the vertebrates, together with... Groups Pterosauria Crocodylia (crocodiles) Dinosauria    Aves (birds) Archosaurs (Greek for ruling reptiles) are a group of diapsid reptiles that first appeared during the late Permian (roughly 250 million years ago). ... Orders Saurischia    Sauropodomorpha    Theropoda Ornithischia Dinosaurs are animals that dominated the terrestrial ecosystem for over 100-million years. ... Groups Sauropodomorpha    Saturnalia    Prosauropoda    Sauropoda Theropoda    Eoraptor    Herrerasauridae    Ceratosauria    Tetanurae Saurischians (from the Greek Saurischia meaning lizard hip) are one of the two orders/branches of dinosaurs. ... Subdivisions Ceratosauria Spinosauria Carnosauria Coelurosauria Theropods (beast foot) are a group of bipedal saurischian dinosaurs. ... Coelurosauria is a group of theropod dinosaurs that includes the subgroups Tyrannosauridae, Ornithomimidae, and Maniraptora. ... Maniraptora is a group used in biological classification to cover the birds and the dinosaurs that were related to them. ... Families Dromaeosauridae Troodontidae The Deinonychosauria were a successful clade of theropods in the Cretaceous period. ... Genera Achillobator Adasaurus Atrociraptor Bambiraptor Cryptovolans Dromaeosauroides Dromaeosaurus Deinonychus Graciliraptor Microraptor Pyroraptor Saurornitholestes Sinornithosaurus Utahraptor Variraptor Velociraptor Dromaeosaurids, raptors or members of the family Dromaeosauridae (running lizards) are theropod dinosaurs. ... In biology, binomial nomenclature is a standard convention used for naming species. ... Genera Achillobator Adasaurus Atrociraptor Bambiraptor Cryptovolans Dromaeosauroides Dromaeosaurus Deinonychus Graciliraptor Microraptor Pyroraptor Saurornitholestes Sinornithosaurus Utahraptor Variraptor Velociraptor Dromaeosaurids, raptors or members of the family Dromaeosauridae (running lizards) are theropod dinosaurs. ... Orders Saurischia    Sauropodomorpha    Theropoda Ornithischia Dinosaurs are animals that dominated the terrestrial ecosystem for over 100-million years. ... In biology, a species is, loosely speaking, a group of related organisms that share a more or less distinctive form and are capable of interbreeding. ... The Cretaceous period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic period (about 135 mya) to the beginning of the Paleocene epoch of the Tertiary period (65 mya). ... For other uses, see Alberta (disambiguation). ... Drumheller, (51°28′ N 112°44′ W Elevation: 00 feet), is a city in the Badlands of east-central Alberta on the Red Deer River an hour and a half northeast of Calgary. ... Binomial name Deinonychus antirrhopus Ostrom, 1969 Deinonychus antirrhopus (counterbalancing fearsome claw) is a wolf-sized, carnivorous dromaeosaurid dinosaur species from the Early Cretaceous Clovery Formation of Montana. ...

External links

• "Atrociraptor". DinoData.