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Lydekker (1889) described some portions of a skeleton recovered from the same quarry near Hastings that produced the type material of Barilium dawsoni. The type material was redescribed by Norman (2010, 2011b, in press) and on the basis of distinctive features of the holotype ilium, which was supplemented by better-preserved referred material – including specimens that were previously attributed to Iguanodon hollingtoniensis Lydekker, 1889. I. hollingtoniensis is now regarded as a junior subjective synonym of Hypselospinus fittoni (Norman, 2010). Iguanodon fittoni was rediagnosed and renamed as a new nomenclatural combination: Hypselospinus fittoni. This iguanodont appears to be generally somewhat smaller (body length ~6 m) and less robustly built than specimens typical of B. dawsoni. A number of unsupportable claims concerning the osteology, taxonomic status, and affinities of material referable to this renamed taxon have been made by Paul (2008), as outlined in Norman (2010). Carpenter and Ishida (2010: October), subsequent to Norman (2010: May), published an alternative name for the type material of I. fittoni: Wadhurstia fittoni. The latter can safely be suppressed because it is a junior objective synonym of Hypselospinus fittoni.

2.5. Hypselospinus cf. fittoni, NHMUK R604. Third dorsal. (A, A1) Lateral ([A] is a reversed image of the right side); (B) ventral; (C) anterior. Abbreviations: dia, diapophysis; k, midline keel; ncs, neurocentral suture; ns, neural spine; par, parapophysis; poz, posterior zygapophysis; prz, anterior zygapophysis; rs, rugose surface for ligamentous attachment of the neck of the rib. Scale bar equals 10 cm (from Norman, in press).