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Pisanosaurus
''Pisanosaurus'' (pron.:"PIE-san-uh-SAWR-us") is an extinct genus of primitive ornithischian dinosaur that lived approximately 228 to 216 million years ago during the latter part of the Triassic Period in what is now South America. It was a small, lightly-built, ground-dwelling, bipedal herbivore, that could grow up to an estimated long. Only one species, the type, ''Pisanosaurus mertii'', is known, based on a single partial skeleton discovered in Argentina's Ischigualasto Formation.
The exact classification of ''Pisanosaurus'' has been the topic of debate by scientists for over 40 years; the current consensus is that ''Pisanosaurus'' is the oldest known ornithischian, part of a diverse group of dinosaurs which lived during nearly the entire span of the Mesozoic Era.
==Etymology==
The genus name ''Pisanosaurus'', means "Mr. Pisano’s lizard", and is derived the "Pisano" in honor of Argentine paleontologist Juan A. Pisano of La Plata Museum, and "sauros" from the Greek (σαύρα) meaning "lizard".〔(【引用サイトリンク】url=http://www.dinochecker.com/dinosaurs/PISANOSAURUS )〕 ''Pisanosaurus'' was described and named by Argentine paleontologist Rodolfo Casamiquela in 1967. The type and only valid species known today is ''Pisanosaurus mertii''. The specific name honors the late Araucanian naturalist Carlos Merti.
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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