Temporal range: 130–127 Ma
The type specimen, MPT/I.G, was found in the spring of 1958 by amateur palaeontologist José María Herrero Marzo. Starting from 25 September 1958, it was collected by Professor Dimas Femández-Galiano, assisted by a Dutch team from the University of Utrecht led by Gustav Heinrich Ralph von Koenigswald. The finds were originally assigned to Iguanodon bernissartensis by Albert-Félix de Lapparent in 1960.
It was discovered and collected from La Maca 3 locality in the Camarillas Formation of Galve dating to the early Barremian stage (about 130-127 million years ago), and consists of a partial skeleton lacking the skull, of an adult individual. It consists of four cervical vertebrae, twenty-eight neurapophyses, two sacral vertebrae, fourteen caudal vertebrae, fragments of cervical, dorsal and sternal ribs, fragments of five chevrons, numerous ossified tendons and a left pubis and ilium. Some other bones, misidentified by de Lapparent as those of the sauropod Aragosaurus, were later referred to Delapparentia, among them an ischium.
In 2006, José Ignacio Ruiz-Omeñaca named this material as a new taxon, Delapparentia turolensis, in a dissertation; since names published in theses are invalid nomina ex dissertatione, he subsequently validly named it in a 2011 paper. The generic name honours de Lapparent, while the specific name is derived from the Latin name of Teruel, Turia.
Delapparentia was a large species, about 15% longer than Iguanodon bernissartensis. The length has been estimated at 10 metres (33 ft), the weight at 3.5 tonnes (3.9 tons). The ilium is 78 centimetres (31 in) long. In the initial description of the genus by Ruiz-Omeñaca, several autapomorphies (unique characteristics) of Delapparentia were established: posterior dorsal ribs with long, parallel and unfused capitula and tubercula, ossified sternal ribs, and a straight and lateromedially expanded preacetabular process of the ilium. It also presents a unique combination of characters, including anterior dorsal ribs with a pneumatic foramen and an ischium that is large in relation to the ilium. On the basis of new remains, Gasca et al. provided a revised diagnosis in which they recognized the proportionally high neural spines, and related it to the earlier Barilium from England on the basis of its ilium morphology.
Delapparentia was assigned to the Iguanodontoidea by Ruiz-Omeñaca in 2011. The identification of Delapparentia as a distinct taxon has been challenged; Verdú et al. conducted a study of individual variation among specimens of Iguanodon bernissartensis, and found that the neural spine proportions of Delapparentia were not particularly outside the range of variation in I. bernissartensis. They considered Delapparentia to represent an old adult individual of I. bernissartensis.
Aralosaurini is a tribe of basal lambeosaurine hadrosaurs endemic to Eurasia. It currently contains Aralosaurus (from the Aral sea of Kazakhstan) and Canardia (from Toulouse, Southern France).Canardia
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Iguanodontia (the iguanodonts) is a clade of herbivorous dinosaurs that lived from the Middle Jurassic to Late Cretaceous. Some members include Camptosaurus, Dryosaurus, Iguanodon, Tenontosaurus, and the hadrosaurids or "duck-billed dinosaurs". Iguanodontians were one of the first groups of dinosaurs to be found. They are among the best known of the dinosaurs, and were among the most diverse and widespread herbivorous dinosaur groups of the Cretaceous period.Jaxartosaurus
Jaxartosaurus is a genus of hadrosaurid dinosaur similar to Corythosaurus which lived during the Late Cretaceous. Its fossils were found in Kazakhstan.Jeyawati
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Osmakasaurus is a genus of herbivorous iguanodontian dinosaur. It is a basal iguanodontian which lived during the lower Cretaceous period (Valanginian age) in what is now Buffalo Gap of South Dakota, United States. It is known from the Chilson Member of the Lakota Formation. This genus was named by Andrew T. McDonald in 2011 and the type species is Osmakasaurus depressus. O. depressus was previously referred to as Camptosaurus depressus, and was first described in 1909 by Charles W. Gilmore.Parasaurolophini
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Pareisactus (from the Greek "pareisaktos", meaning "intruder", referring to being represented as a single element among hundreds of hadrosaurid bones) is a genus of rhabdodontid ornithopod dinosaur from the Late Cretaceous Conquès Member of the Tremp Formation in the Southern Pyrenees of Spain. The type and only species is P. evrostos, known only from a single scapula.Plesiohadros
Plesiohadros is an extinct genus of hadrosauroid dinosaur. It is known from a partial skeleton including the skull collected at Alag Teg locality, from the Campanian Djadochta Formation of southern Mongolia. The type species is Plesiohadros djadokhtaensis.Rhabdodontomorpha
Rhabdodontomorpha is a clade of basal iguanodont dinosaurs. This group was named in 2016 in the context of the description, based on Spanish findings, of an early member of the Rhabdodontidae. A cladistic analysis was conducted in which it was found that Muttaburrasaurus was the sister species of the Rhabdodontidae sensu Weishampel. Therefore, Paul-Emile Dieudonné, Thierry Tortosa, Fidel Torcida Fernández-Baldor, José Ignacio Canudo and Ignacio Díaz-Martínez defined Rhabdodontomorpha as a nodal clade: the group consisting of the last common ancestor of Rhabdodon priscus Matheron, 1869 and Muttaburrasaurus langdoni Bartholomai and Molnar, 1981; and all its descendants. Within the clade are included also Zalmoxes and Mochlodon.The group consists of small to large plant eaters from Europe and Gondwana. It must have split from other iguanodont groups during the Middle Jurassic.Sahaliyania
Sahaliyania (from "black" in Manchu, a reference to the Amur/Heilongjiang River) is a genus of lambeosaurine hadrosaurid dinosaur (crested duckbilled dinosaur) from the Late Cretaceous of Heilongjiang, China.Tsintaosaurini
Tsintaosaurini is a tribe of basal lambeosaurine hadrosaurs native to Eurasia. It currently contains only Tsintaosaurus (from China) and Pararhabdodon (from Spain ).Koutalisaurus, also known from late Cretaceous Spain and formerly referred to Pararhabdodon
, may also be a tsintaosaurin because of its association with the latter genus; some recent work also suggests it may indeed be referrable to Pararhabdodon.Xuwulong
Xuwulong is a genus of hadrosauroid dinosaur from the Early Cretaceous period. It lived during the early Cretaceous period (Aptian-Albian age) in what is now Yujingzi Basin in the Jiuquan area, Gansu Province of northwestern China. It is known from the holotype – GSGM F00001, an articulated specimen including a complete cranium, almost complete axial skeleton, and complete left pelvic girdle from Xinminpu Group. Xuwulong was named by You Hailu, Li Daqing and Liu Weichang in 2011 and the type species is Xuwulong yueluni.