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Fruitadens
''Fruitadens'' is a genus of heterodontosaurid dinosaur. The name means "Fruita tooth", in reference to Fruita, Colorado (USA), where its fossils were first found. It is known from partial skulls and skeletons from at least four individuals of differing biological ages, found in Tithonian (Late Jurassic) rocks of the Morrison Formation in Colorado. ''Fruitadens'' is the smallest known ornithischian dinosaur, with young adults estimated at in length and in weight. It is interpreted as an omnivore and represents one of the latest-surviving heterodontosaurids.
==History of discovery==
''Fruitadens'' is known from fossils recovered under a valid paleontological permit in the 1970s and 1980s by teams led by George Callison, for the Natural History Museum of Los Angeles County (LACM). The discovery area, on lands managed by the Bureau of Land Management, is known as the Fruita Paleontological Area; the specimens were found there in sandstones of the Brushy Basin Member. Roughly equivalent beds have been dated to 150.3 ± 0.3 million years old and 150.2 ± 0.5 million years old, indicating an early Tithonian age.
The fossils now named ''Fruitadens'' were first thought to belong to a fabrosaurid similar to ''Echinodon'', a genus from the Early Cretaceous of England; Fabrosauridae at the time was considered a general group of primitive ornithopods, and ''Echinodon'' itself had not yet been reclassified as a heterodontosaurid. ''Fruitadens'', although not formally described for a number of years, was briefly described in several works, usually as a relative of ''Echinodon'' or a new species of the genus. Formal description came in January 2010, by Richard Butler and colleagues (though the paper was published online before print in late 2009). The type species is ''F. haagarorum'', in recognition of support provided by Paul Haaga Jr., Heather Haaga, Blythe Haaga, Paul Haaga III, and Catalina Haaga for the Natural History Museum of Los Angeles County.
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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