The genus attracted little attention until Peter Galton began his revision of hypsilophodonts in the 1970s . " Parksosaurus " received a redescription in 1973, wherein it was considered to be related to a " Hypsilophodon " \ " Laosaurus " \ " L . minimus " lineage.
22.
I . foxii ( also spelled I . foxi ) was originally described by Thomas Henry Huxley in 1869 as the type species of Hypsilophodon; Owen ( 1873 or 1874 ) reassigned it to Iguanodon, but his assignment was soon overturned . [ 48 ] I . hollingtoniensis ( also spelled I . hollingtonensis ), described by Lydekker in 1889, is a synonym of I . fittoni.
