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Priconodon
''Priconodon'' is an extinct genus of dinosaur (perhaps nodosaurid), known from its large teeth. Its remains have been found in the Aptian-Albian age Lower Cretaceous Arundel Formation of Muirkirk, Prince George's County, Maryland, USA.
==History==
O. C. Marsh named the genus for USNM 2135, a large worn tooth from what was then called the Potomac Formation. As ankylosaurians were by and large unknown at the time, he compared it to ''Diracodon'' (=''Stegosaurus'') teeth.〔Marsh, O.C. (1888). Notice of a new genus of Sauropoda and other new dinosaurs from the Potomac Formation. ''American Journal of Science'' 135:89-94.〕 It was not identified as an ankylosaurian until Walter Coombs assigned it to Nodosauridae in 1978.〔Coombs, Jr., W.P. (1978). The families of the ornithischian dinosaur order Ankylosauria. ''Palaeontology'' 21(1):143-170.〕
In 1998 Kenneth Carpenter and James Kirkland, in a review of North American Lower Cretaceous ankylosaurs, considered it tentatively valid as an unusually large nodosaurid, larger than all those described before.〔Carpenter, K., and Kirkland, J.I. (1998). Review of Lower and middle Cretaceous ankylosaurs from North America. In: Lucas, S.G., Kirkland, J.I., and Estep, J.W. (eds.). ''Lower and Middle Cretaceous Terrestrial Ecosystems.'' New Mexico Museum of Natural History and Science Bulletin 14:249-270.〕 Carpenter (2001) retained it as a valid nodosaurid, but did not employ it in his phylogenetic analysis.〔Carpenter, K. (2001). Phylogenetic analysis of the Ankylosauria. In: Carpenter, K. (ed.). ''The Armored Dinosaurs.'' Indiana University Press:Bloomington 455-483. ISBN 0-253-33964-2〕 Vickaryous ''et al.'' (2004), in a review of armored dinosaurs, considered it to be dubious without comment.〔Vickaryous, M.K., Maryańska, T., and Weishampel, D.B., (2004). Ankylosauria. In: Weishampel, D.B., Dodson, P., and Osmólska, H. (eds.). The Dinosauria (second edition). University of California Press:Berkeley 363-392. ISBN 0-520-24209-2〕 West and Tibert, however, followed this with a preliminary account of a morphometric study that found it to be a unique genus.〔(West, A. and Tibert, N. (2004). Quantitative analysis for the type material of ''Priconodon crassus'': a distinct taxon from the Arundel Formation in souther Maryland. ''Geological Society of America Abstracts with Programs'', 36(5):423. )〕
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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