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Trimucrodon
''Trimucrodon'' (meaning "three-pointed tooth") is a genus of herbivorous dinosaur from the Late Jurassic or Early Cretaceous of what is now Portugal. It has been classified as a basal ornithischian, but is a ''nomen dubium'': it is a "tooth genus" known only from its teeth.
Between 1962 and 1967 German zoologist and paleontologist Georg Krusat uncovered mammal fossils near Porto Dinheiro, Lourinha,〔G. Krusat, 1969, "Ein Panthotheria-Molar mit dreispitzigem Talonid aus dem Kimmeridge von Portugal", ''Palaeontologische Zeitschrift'' 43(1/2): 52-56〕 in layers of the Camadas de Alcobaça Formation. This rock unit was then seen as dating from the Kimmeridgian stage, around 150 to 155 million years ago but was later suggested to date to the Cretaceous (early Berriasian stage), about 145 million years old.〔Ruiz-Omeñaca J.I. & Canudo, J.I., 2004, "Dinosaurios ornitópodos del Cretácico inferior de la Península Ibérica", ''Geo-Temas'', 6(5): 63-65〕 One small tooth was recognised by Richard A. Thulborn as dinosaurian instead of mammalian and in 1973 he described and named it ''Trimucrodon cuneatus''; the paper was not published until 1975.〔Thulborn, R.A. (1975). "Teeth of ornithischian dinosaurs from the Upper Jurassic of Portugal, with description of a hypsilophodontid (''Phyllodon henkeli'' gen. et sp. nov.) from the Guimarota lignite". ''Serviços Geológicos de Portugal, Memória (Nova Série)'' 22:89-134 〕 The generic name is derived from Latin ''tri~'', "three", and ''mucro'', "dagger point", and Greek ''odous'', "tooth". The specific name means "wedge-shaped" in Latin. The holotype tooth is part of the collection of the Lehrstuhl fur Paläontologie, Freie Universität at Berlin but has no published inventory number. Some other Portuguese teeth from the formation were referred to the species.
Thulborne originally classified ''Trimucrodon'' as a member of the Fabrosauridae. José Ignacio Ruiz-Omeñaca in 2001 placed it within the Heterodontosauridae.〔Ruiz-Omeñaca, J.I., 2001, ''Dinosaurios hipsilofodontidos (Ornithischia: Ornithopoda) en la Peninsula Iberica''. Colectivo Arqeologico-Paleontologico de Salas, C.A.S., pp. 266〕 However, recent authors have considered it a basal ornthischian of uncertain affiliations.
==See also==
* List of dinosaurs
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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