(meaning "beaked Rhynchosaurs lizards") were a group of unusual herbivorous quadrupedal archosauromorphs that lived during the Triassic period. Rhynchosaurs ranged in size from the 50 cm long to the 2 meter (6 feet) long Rhynchosaurus , with the average size being 1 meter (3.3 feet). Rhynchosaurs were a widespread and worldwide Hyperodapedon taxon, being found all across the supercontinent of Pangaea. Rhynchosaur fossils have been found in Britain, South Africa, Zimbabwe, Tanzania, Madagascar, India, Brazil, Argentina, Canada and the United States, although they are poorly represented in the Northern Hemisphere fossil record. 15 species are currently regarded as valid, and another five are valid taxa still in need of a name. In some fossil assemblages, several taxa lived alongside one another, as evidenced by the four contemporaneous species were contemporaneous in the Upper Triassic Santa Maria Formation of Brazil. Rhynchosaurs went extinct during the Permian-Triassic extinction event that marked the end of the Carnian stage of the Late Triassic. Rhynchosaur fossils are very abundant in some assemblages (in some fossil localities accounting for 40 to 60% of specimens found) and the anatomy and ontogeny of a few species is comparatively well known. Early primitive forms like and Mesosuchus were more typically lizard-like in build, and had skulls rather similar to the early Howesia diapsid , except for the Younginia beak and a few other features.
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newest articles: is an American Paul Sereno paleontologist who is the discoverer of several new dinosaur species on several continents. He has conducted excavations at sites as varied as Inner Mongolia, Argentina, Morocco and Niger. He is a professor at the University of Chicago and a National Geographic "explorer-in-residence." Sereno's most widely publicized discovery is that of a nearly complete specimen of (popularly known as SuperCroc) at Gadoufaoua in the Tenere desert of Niger. Other major discoveries include Sarcosuchus imperator - the oldest known dinosaur fossil, Eoraptor , the first good skull of Jobaria , Carcharodontosaurus iguidensis , Afrovenator and the African Suchomimus pterosaur.
" When out " fossil hunting, it is very easy to forget that rather than telling you how the creatures lived, the remains you find indicate only where they became fossilized.
—Co-author with American science writer Roger Amos Lewin ( 1946), Origins: What New Discoveries Reveal about the Emergence of our Species and its Possible Future ( 1977), 96.
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Range of possible habitual head angles in the
basal sauropodomorph A. Massospondylus, and the sauropods B. , Camarasaurus C. and Diplodocus D. .
, comprise an sauropods infraorder or clade of saurischian (" lizard-hipped") dinosaurs. They are notable for the enormous sizes attained by some species, and the group includes many of the largest animals to have ever lived on land. Well-known genera include (formerly known as Apatosaurus Brontosaurus), and Brachiosaurus . Sauropods first appeared in the Diplodocus Late Triassic Period, where they somewhat resembled the closely related (and possibly ancestral) group Prosauropoda. By the Late Jurassic (150 million years ago), sauropods were widespread (especially the diplodocids and brachiosaurids). By the Late Cretaceous, those groups had mainly been replaced by the titanosaurs, which had a near-global distribution. However, as with all other non-avian dinosaurs, the titanosaurs died out in the Cretaceous–Tertiary extinction event. Fossilised remains of sauropods have been found on every continent except Antarctica.
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