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''Barilium'' is a genus of iguanodontian dinosaur which was first described as a species of '' Iguanodon'' (''I. dawsoni'') by Richard Lydekker in 1888, the 
In 2010 it was reclassified as a separate genus by David Norman. The generic name ''Barilium'' is derived from Greek ''barys'', "heavy", and Latin '' ilium''. Later in 2010, Kenneth Carpenter and Yusuke Ishida independently assigned it to the new genus ''Torilion'',Carpenter, K. and Ishida, Y. (2010).
Early and “Middle” Cretaceous Iguanodonts in Time and Space.
''
specific epithet
In taxonomy, binomial nomenclature ("two-term naming system"), also called nomenclature ("two-name naming system") or binary nomenclature, is a formal system of naming species of living things by giving each a name composed of two parts, bot ...
honouring the discoverer Charles Dawson
Charles Dawson (11 July 1864 – 10 August 1916) was a British amateur archaeologist who claimed to have made a number of archaeological and palaeontological discoveries that were later exposed as frauds. These forgeries included the Piltdow ...
.
In 2010 it was reclassified as a separate genus by David Norman. The generic name ''Barilium'' is derived from Greek ''barys'', "heavy", and Latin '' ilium''. Later in 2010, Kenneth Carpenter and Yusuke Ishida independently assigned it to the new genus ''Torilion'',Carpenter, K. and Ishida, Y. (2010).Early and “Middle” Cretaceous Iguanodonts in Time and Space.
''
Journal of Iberian Geology
''Journal of Iberian Geology'' (formerly ''Cuadernos de Geología Ibérica'') is a triannual peer-reviewed scientific journal published by the Universidad Complutense de Madrid. The journal covers the field of geology and related earth sciences ...
'', 36 (2): 145-164. which is thus a junior objective synonym of ''Barilium''. It is known from two partial skeletons found near St Leonards-on-Sea
St Leonards-on-Sea (commonly known as St Leonards) is a town and seaside resort in the Borough of Hastings in East Sussex, England. It has been part of the borough since the late 19th century and lies to the west of central Hastings. The origina ...
in East Sussex
East Sussex is a ceremonial and non-metropolitan county in South East England on the English Channel coast. It is bordered by Kent to the north and east, West Sussex to the west, and Surrey to the north-west. The largest settlement in East Su ...
, England, from the middle Valanginian-age Lower Cretaceous Wadhurst Clay. Lydekker based the species on the syntype series BMNH R798, 798a, 803-805, 806, 798b, 802, 802a and 799-801. Norman chose NHMUK R 798 and R802, a dorsal vertebra and a left ilium, as the lectotype.
A contemporary of '' Hypselospinus'' (also once thought to be a species of ''Iguanodon''), ''Barilium'' was a robust iguanodontian estimated at long.
''Barilium'' is separated from ''Hypselospinus'' on the basis of vertebral and pelvic characters, size, and build. 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".
References
{{Taxonbar, from=Q1932480 Iguanodonts Valanginian life Early Cretaceous dinosaurs of Europe Cretaceous England Fossils of England Fossil taxa described in 2010 Taxa named by David B. Norman Ornithischian genera