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Gideonmantellia
''Gideonmantellia'' is an extinct genus of basal ornithopod dinosaur known from the Early Cretaceous (Barremian stage) of Galve, Province of Teruel, Spain. It contains a single species, ''Gideonmantellia amosanjuanae''.
==Discovery and naming==
In 1982, amateur palaeontologist José María Herrero Marzo together with his son Jesús uncovered in a loam pit near Galve, the ''Poyales Barranco Canales'' site, the remains of a small euornithopod. In 1987 from this material by José Luis Sanz a left femur and ilium were described, which he referred to ''Hypsilophodon foxii''.〔Sanz, J. L., A. D. Buscalioni, M.-L. Casanovas & J.-V. Santafé, 1987, "Dinosaurios del Cretacico Inferior de Galve (Teruel, España)", ''Estudios Geologicos, Volumen Extra Galve-Tremp'', Madrid, pp 45-64〕 In 1995 José Ignacio Ruiz-Omeñaca realised the find represented a separate taxon,〔Ruiz-Omeñaca, J.I. & G. Cuenca-Bescos, 1995, "Un nuevo dinosaurio hipsilofodontido (Ornitischia) del Barremiense Inferior de Galve (Teruel)", ''XI Jornadas de Paleontologia, Tremp'', pp. 153-157〕 after he had further prepared the bones in 1994 and 1995. Ruiz-Omeñaca continued his studies from 1996, as part of his thesis. In 2001 he published a more detailed and complete description,〔Ruiz-Omeñaca, J.I., 2001, "Dinosaurios hipsilofodóntidos (Ornithischia : Ornithopoda) en la Penénsula Iberica", In: Colectivo Arqueológico Paleontológico de Salas (Eds), ''Actas de las I Jornadas Internacionales sobre Paleontología de Dinosaurios y su Entorno, Salas de los Infantes'' pp. 175-266〕 in 2004 reaffirming that a new species had been discovered.〔Ruiz-Omeñaca, J.I., J.I. Canudo & J.L. Barco, 2004, "Two new ornithopod dinosaurs from the Lower Cretaceous (Lower Barremian, Camarillas Formation) of Galve (Teruel, Spain)", In : Dostal, O., R. Gregorova & M. Ivanov (Eds), ''2nd EAVP Meeting. July 19-24, 2004. Brno, Czech Republic. Abstracts of Papers and Posters with Program, Excursion Guidebook'', p. 41〕 In 2006, in his doctoral thesis he named this ''Gideonmantellia amosanjuanae''; as a ''nomen ex dissertatione'' this name was as yet invalid though.〔Ruiz-Omeñaca, J.I., 2006, ''Restos directos de dinosaurios (Saurischia, Ornithischia) en el Barremiense (Cretácico Inferior) de la Cordillera Ibérica en Aragón (Teruel, España)''. Tesis Doctoral, Facultad de Ciencias, Universidad de Zaragoza, España pp 584〕
In 2012, the type species ''Gideonmantellia amosanjuanae'' was validly named and redescribed by Ruiz-Omeñaca, José Ignacio Canudo, Gloria Cuenca-Bescós, Penélope Cruzado-Caballero, José Manuel Gasca and Miguel Moreno-Azanza. The generic name honours the first describer of ''Hypsilophodon'', Gideon Mantell. The specific name honours the late palaeontologist María Olga Amo Sanjuán, who studied the Cretaceous Galve fauna.〔
The holotype, MPG-PBCH, was found in a fluvial deposit of the Camarillas Formation, dating from the early Barremian. It consists of a partial articulated skeleton, lacking the skull, of a juvenile individual, including thirty-three vertebrae of the back, hip and tail, twenty-one fragments of the neural arches, six chevrons, rib fragments, ossified tendons, the left pelvis and both hindlimbs. The specimen is part of the collection of the Museo Paleontológico de Galve and displayed in the palaeontological hall of the townhall of Galve.
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