The holotype was discovered in 1863. It was first described by
Thomas Henry Huxley in 1867 based on
holotype NHMUK R1626, a proximal end of a left tibia (misidentified as a distal femur). However, Huxley declined to provide a species name. In his 1889 catalogue of fossil reptiles in the Natural History Museum in London, Richard Lydekker mistakenly considered
Orosaurus preoccupied by the lizard genus
Oreosaurus and coined
Orinosaurus capensis for NHMUK R1626. Along with
Euskelosaurus, Lydekker considered
Orosaurus (
Orinosaurus of his usage) to be an ornithischian dinosaur. von Huene (1940) treated
Orosaurus as a species of
Euskelosaurus, as
E. capensis. van Heerden (1979) considered
Orosaurus a synonym of
Euskelosaurus. However, Gauffre (1996) referred
Orosaurus to his
nomen ex dissertationae "Kholumolumosaurus" (now
Kholumolumo) along with
Meroktenos and
Plateosauravus. Meanwhile,
Orosaurus was listed as a
nomen dubium in the 2nd edition of
The Dinosauria. ==References==