Cumnoria

Cumnoria is a genus of herbivorous iguanodontian dinosaur. It was a basal iguanodontian that lived during the Late Jurassic period (Kimmeridgian age) in what is now Oxfordshire, United Kingdom.
Description.
The holotype of "Cumnoria" is of a rather small bipedal animal with a slender build. about 3.5 metres (11.4 feet) long, The specimen is probably that of a juvenile though.
History of discovery.
"Cumnoria" is known from the holotype OXFUM J.3303, a partial skull and postcranium, recovered from the lower Kimmeridge Clay Formation, in the Chawley Brick Pits, Cumnor Hurst. Workers at first discarded the remains on a dump heap, but one of them later collected the bones in a sack and showed them to Professor George Rolleston, an anatomist at the nearby Oxford University. Rolleston in turn brought them to the attention of palaeontologist Professor Joseph Prestwich who in 1879 reported them as a new species of "Iguanodon", though without actually coining a species name. In 1880 Prestwich published an article on the geological stratigraphy of the find. The same year John Whitaker Hulke named the species "Iguanodon prestwichii", the specific epithet honouring Prestwich.
In 1888, Harry Govier Seeley decided the taxon represented a new and separate genus which he named "Cumnoria" after Cumnor, the village where it was discovered. Its type species "Iguanodon prestwichii" was thus recombined into "Cumnoria prestwichii" — though Seeley spelled the epithet as "prestwichi". The genus was quickly abandoned however: already in 1889 Richard Lydekker assigned the species to "Camptosaurus", as "Camptosaurus prestwichii". This opinion was generally accepted for over a century. In 1980 Peter Galton provided the first modern description of the species.
In 1998 David Norman concluded that Seeley's original generic distinction was valid. In 2008 this was supported by Darren Naish and David Martill. In 2010 and 2011 cladistic analyses by Andrew T. McDonald confirmed this by showing that "Cumnoria" had a separate phylogenetic position from "Camptosaurus dispar". However, in 2015, "Uteodon" and "Cumnoria" were synonymized with "Camptosaurus," but as distinct species.
Classification.
"Camptosaurus prestwichii" was traditionally assigned to the Camptosauridae. In the new analyses of McDonald "Cumnoria" has instead been recovered as a basal member of the Styracosterna, more closely related to more derived ("advanced") iguanodontians than to "Camptosaurus dispar". "Cumnoria" would then be the oldest known styracostern.