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Dreadnoughtus
''Dreadnoughtus'' is a genus of giant titanosaurian sauropod dinosaur which contains a single species, ''Dreadnoughtus schrani''. ''D. schrani'' is known from two partial skeletons discovered in Upper Cretaceous (Campanian-Maastrichtian; 84–66 Ma) rocks of the Cerro Fortaleza Formation in Santa Cruz Province, Argentina. It is one of the largest of all known terrestrial vertebrates, possessing the greatest mass of any land animal that can be calculated with reasonable certainty. ''Dreadnoughtus schrani'' is known from a more complete skeleton than any other gigantic titanosaurian.
==Etymology==
"Dreadnought" is an English term for the predominant type of battleship in the early 20th century, deriving from the words "dread" (fear) + "nought" (nothing). According to the research team that discovered the taxon, the genus name ''Dreadnoughtus'' "alludes to the gigantic body size of the taxon (which presumably rendered healthy adult individuals nearly impervious to attack)" and to the two Argentine dreadnoughts that served in the first half of the twentieth century, ''Rivadavia'' and ''Moreno''. Thus, the genus name also honors the country in which ''Dreadnoughtus schrani'' was discovered. The name of the type species, ''schrani'', was given in recognition of the American entrepreneur Adam Schran for his financial support of the project.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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