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Ultrasaurus (meaning "ultra lizard" [2]) is a genus of sauropod dinosaur discovered by Haang Mook Kim in South Korea. However, the name was first used unofficially (as a nomen nudum ) in 1979 by Jim Jensen to describe a set of giant dinosaur bones he discovered in the United States.
James A. Jensen in preparation lab at BYU with Ultrasaurus foot. James Alvin Jensen (August 2, 1918 – December 14, 1998) was an American paleontologist.His extensive collecting program at Brigham Young University in the Utah–Colorado region which spanned 23 years was comparable in terms of the number of specimens collected to that of Barnum Brown during the early 20th century.
The Brachiosauridae ("arm lizards", from Greek brachion (βραχίων) = "arm" and sauros = "lizard") are a family or clade of herbivorous, quadrupedal sauropod dinosaurs. [1] Brachiosaurids had long necks that enabled them to access the leaves of tall trees that other sauropods would have been unable to reach. [ 2 ]
Sauroposeidon (/ ˌ s ɔːr oʊ p oʊ ˈ s aɪ d ən / SOR-o-po-SY-dən; meaning "lizard earthquake god", after the Greek god Poseidon [3] [4]) is a genus of sauropod dinosaur known from several incomplete specimens including a bone bed and fossilized trackways that have been found in the U.S. states of Oklahoma, Wyoming, and Texas.
The most important metric for understanding the anatomy of a fossil animal is the types of bones. The completeness statistics for Dreadnoughtus schrani are as follows: 116 bones out of ~256 in the entire skeleton (including the skull) = 45.3% complete; 115 bones out of ~196 in the skeleton (excluding the skull) = 58.7% complete
The coracoid is incomplete, but enough is preserved to show it is rectangular, and longer, at 35 cm (14 in), than it is wide—38 cm (15 in). A 94 cm (37 in) long humerus is known, and complete with minimal crushing. The bone is short and stout, with a robust crest for the deltoid muscle along the upper half of the bone. [10]
The braincase is mostly hidden from view by overlying bones; only the occipital region (rear part) is exposed. The uppermost bone of the occipital region is the supraoccipital, which in Bajadasaurus was completely fused to the exoccipital-opisthotic bone below and featured a distinct and narrow longitudinal ridge, the sagittal nuchal crest.
Edward Drinker Cope was the only paleontologist to study M. fragillimus before its only known specimen disappeared. The gigantic vertebra has often been ignored in summaries of the largest dinosaurs partly because, according to subsequent reports, the whereabouts of both the vertebra and the femur are unknown, and all attempts to locate them have failed.