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Superregnum: Eukaryota
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Cladus: Craniata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Classis: Reptilia
Cladus: Eureptilia
Cladus: Romeriida
Subclassis: Diapsida
Cladus: Sauria
Infraclassis: Archosauromorpha
Cladus: Crurotarsi
Divisio: Archosauria
Subsectio: Ornithodira
Subtaxon: Dinosauromorpha
Cladus: Dinosauria
Ordo: †Ornithischia
Cladus: †Genasauria
Cladus: †Neornithischia
Cladus: †Cerapoda
Cladus: †Ornithopoda
Cladus: †Iguanodontia

Genus: Hypselospinus
Species: H. fittoni

[species after Norman (2010)]
Name

Hypselospinus Norman, 2010
Gender

masculine
Type species

Iguanodon fittoni Lydekker, 1889, by original designation

References
cited sources

Norman, D.B. 2010: A taxonomy of iguanodontians (Dinosauria: Ornithopoda) from the lower Wealden Group (Cretaceous: Valanginian) of southern England. Zootaxa, 2489: 47–66. Preview

Hypselospinus is a genus of iguanodontian dinosaur which was first described as a species of Iguanodon (I. fittoni) by Richard Lydekker in 1889, the specific name honouring William Henry Fitton.[1]

In May 2010 the fossils comprising Hypselospinus were by David Norman reclassified as a separate genus, among them the holotype BMNH R1635, consisting of a left ilium, a sacrum, tail vertebrae and teeth. The generic name is derived from Greek hypselos, "high" and Latin spina, "thorn", in reference to the high vertebral spines. Later that same year, a second group of scientists independently re-classified I. fittoni into a new genus they named Wadhurstia,[2] which thus is a junior objective synonym of Hypselospinus. Hypselospinus lived during the lower Valanginian stage, around 140 million years ago.[2][3] A contemporary of Barilium (also once thought to be a species of Iguanodon), Hypselospinus was a lightly built iguanodontian estimated at 6 metres (19.7 ft) long.[4] The species Iguanodon fittoni was described from the lower Valanginian-age Lower Cretaceous Wadhurst Clay[2] of East Sussex, England.[5] Remains from Spain may also pertain to it. Norman (2004) wrote that three partial skeletons are known for it,[5] but this is an error.[6]

Hypselospinus is separated from Barilium on the basis of vertebral and pelvic characters, size, and build.[4] For example, Barilium was more robust than Hypselospinus, with large Camptosaurus-like vertebrae featuring short neural spines, whereas Hypselospinus is known for its "long, narrow, and steeply inclined neural spines".[5]
References

Lydekker, Richard (1889). "Notes on New and other dinosaurian remains". Geological Magazine. 6 (8): 352–356. doi:10.1017/S0016756800176587.
Carpenter, K. and Ishida, Y. (2010). "Early and “Middle” Cretaceous Iguanodonts in Time and Space.[permanent dead link]" Journal of Iberian Geology, 36 (2): 145-164.
Norman, David B. (2010). "A taxonomy of iguanodontians (Dinosauria: Ornithopoda) from the lower Wealden Group (Cretaceous: Valanginian) of southern England" (PDF). Zootaxa. 2489: 47–66. doi:10.11646/zootaxa.2489.1.3.
Blows, W. T. (1997). "A review of Lower and middle Cretaceous dinosaurs from England". In Lucas, S.G.; Kirkland, J.I.; Estep J.W. (eds.). Lower and Middle Cretaceous Terrestrial Ecosystems. New Mexico Museum of Natural History and Science Bulletin, 14. New Mexico Museum of Natural History and Science. pp. 29–38.
Norman, David B. (2004). "Basal Iguanodontia". In Weishampel, D.B.; Dodson, P.; Osmólska H. (eds.). The Dinosauria (2nd ed.). Berkeley: University of California Press. pp. 413–437. ISBN 0-520-24209-2.
Naish, Darren; Martill, David M. (2008). "Dinosaurs of Great Britain and the role of the Geological Society of London in their discovery: Ornithischia". Journal of the Geological Society, London. 165 (3): 613–623. doi:10.1144/0016-76492007-154. S2CID 129624992.

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