Sunday, July 31, 2011

Eustreptospondylus

Eustreptospondylus ("well-curved vertebra", in reference to the arrangement of the spine in the original fossil) is a genus of megalosaurid dinosaur, from the Callovianstage of the Middle Jurassic period (165 to 161 million years ago) in southern England, at a time when Europe was a series of scattered islands (due to tectonic movement at the time which raised the sea-bed and flooded the lowland). The only known specimen of Eustreptospondylus may not be fully grown, and was about 4.63 metres (15.2 ft) long.[1] It was carnivorousbipedal and had a stiffened tail. It was a typical theropod, with powerful hind limbs, erect posture and small forelimbs.


http://en.wikipedia.org/wiki/Eustreptospondylus

Saturday, July 30, 2011

Ornithopods

Ornithopods (pronounced /ɔrˈnɪθɵpɒd/) or members of the clade Ornithopoda (pronounced /ɔrnɨˈθɒpədə/) are a group of bird-hippeddinosaurs that started out as small, bipedal running grazers, and grew in size and numbers until they became one of the most successful groups of herbivores in the Cretaceous world, and dominated the North American landscape. Their major evolutionary advantage was the progressive development of a chewing apparatus that became the most sophisticated ever developed by a reptile, rivaling that of modern mammals like the domestic cow. They reached their apex in the duck-bills, before they were wiped out by the Cretaceous-Tertiary extinction event along with all other non-avian dinosaurs. Members are known from all seven continents, although the Antarctic remains are unnamed, and they are generally rare in the Southern Hemisphere.
http://en.wikipedia.org/wiki/Ornithopod

Sauropods

Sauropods (meaning "Lizard-Footed") were an infraorder of large, four-legged, herbivorous dinosaurs. They had very long necks, small heads with blunt teeth, a small brain, and long tails for counterbalancing their necks. They had large guts, which were necessary for digesting huge amounts of plant material. They walked relatively slowly on four short, thick, five-toed legs. Their nostrils were located on the upper parts of their skulls, sometimes very close to the eyes. A few of the later Sauropods had some body armor (e.g., Titanosauridae).
http://www.enchantedlearning.com/subjects/dinosaurs/glossary/Sauropod.shtml

Sue


"Sue" is the nickname given to FMNH PR 2081, which is the largest, most extensive and best preserved Tyrannosaurus rex specimen ever found.[2] It was discovered in the summer of 1990 by Sue Hendrickson, a paleontologist, and was named after her. After ownership disputes were settled, the fossil was auctioned in October 1997 for US$8.36 million, the highest amount ever paid for a dinosaur fossil,[3] and is now a permanent feature at the Field Museum of Natural History in Chicago,Illinois.[4]
http://en.wikipedia.org/wiki/Sue_(dinosaur)

Theropods

Theropods (theropod /ˈθɛrəpɒd/; suborder name Theropoda /θɨˈrɒpɵdə/, meaning "beast feet") is both a suborder of bipedal saurischian dinosaurs, and a clade consisting of that suborder and its descendants (including modern birds). Dinosaurs belonging to the suborder theropoda were primarily carnivorous, although a number of theropod groups evolved herbivoryomnivory, and insectivory. Theropods first appeared during the Carnian age of the late Triassic period about 230 million years ago (Ma) and included the sole large terrestrial carnivores from the Early Jurassic until at least the close of the Cretaceous, about 65 Ma. In the Jurassic, birds evolved from small specialized coelurosaurian theropods, and are today represented by 9,900 living species.
Among the features linking theropod dinosaurs to birds are the three-toed foot, a furcula (wishbone), air-filled bones and (in some cases) feathers and brooding of the eggs.
http://en.wikipedia.org/wiki/Theropods

weekly video

Tyrannosaurus-Rex

Tyrannosaurus (play /tɨˌrænɵˈsɔrəs/ or /tˌrænɵˈsɔrəs/; meaning "tyrant lizard", from Greek τυράννος (tyrannos, "tyrant") and σαύρος' (sauros, "lizard")) is a genus oftheropod dinosaur. The species Tyrannosaurus rex (rex meaning "king" in Latin), commonly abbreviated to T. rex, is a fixture in popular culture. It lived throughout what is now western North America, with a much wider range than other tyrannosaurids. Fossils are found in a variety of rock formations dating to the Maastrichtianage of the upper Cretaceous Period, 67 to 65.5 million years ago.[1] It was among the last non-avian dinosaurs to exist prior to the Cretaceous–Tertiary extinction event.
Like other tyrannosauridsTyrannosaurus was a bipedal carnivore with a massive skull balanced by a long, heavy tail. Relative to the large and powerful hindlimbs,Tyrannosaurus forelimbs were small, though unusually powerful for their size, and bore two clawed digits. Although other theropods rivaled or exceededTyrannosaurus rex in size, it was the largest known tyrannosaurid and one of the largest known land predators, measuring up to 12.8 m (42 ft) in length,[2] up to 4 metres (13 ft) tall at the hips,[3] and up to 6.8 metric tons (7.5 short tons) in weight.[4] By far the largest carnivore in its environment, Tyrannosaurus rex may have been an apex predator, preying upon hadrosaurs and ceratopsians, although some experts have suggested it was primarily a scavenger. The debate overTyrannosaurus as apex predator or scavenger is among the longest running in paleontology.
More than 30 specimens of Tyrannosaurus rex have been identified, some of which are nearly complete skeletons. Soft tissue and proteins have been reported in at least one of these specimens. The abundance of fossil material has allowed significant research into many aspects of its biology, including life history andbiomechanics. The feeding habits, physiology and potential speed of Tyrannosaurus rex are a few subjects of debate. Its taxonomy is also controversial, with some scientists considering Tarbosaurus bataar from Asia to represent a second species of Tyrannosaurus and others maintaining Tarbosaurus as a separate genus. Several other genera of North American tyrannosaurids have also been synonymized with Tyrannosaurus.
http://en.wikipedia.org/wiki/Tyrannosaurus