Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Superorder: Dinosauria
Order: Ornithischia
Suborder: Ornithopoda
Clade: Iguanodontia
Genus: Proplanicoxa
Carpenter & Ishida, 2010
Binomial name
Proplanicoxa galtoni
Carpenter & Ishida, 2010

Proplanicoxa is a dubious genus of iguanodont dinosaur which existed in what is now England during the Early Cretaceous period (late Barremian stage, around 126 mya).[1]

Proplanicoxa dorsal

Dorsal vertebra of Proplanicoxa from the holotype

The holotype and only specimen of Proplanicoxa, BMNH R 8649, is composed of thirteen dorsals, a sacrum with ilia, parts of the pubis and ischium. The fossils were found in 1916 by Reginald Walter Hooley on the Isle of Wight from the upper Wessex Formation of England.[1] BMNH R 8649 was originally assigned to Vectisaurus valdensis Hulke 1879 (=Mantellisaurus atherfieldensis) by Galton in 1976. The specimen was assigned to its own genus and species by Kenneth Carpenter and Yusuke Ishida in 2010, and the type species is Proplanicoxa galtoni.[1] The generic name is derived from “before” (pro in Greek) and Planicoxa in reference to the postacetabular process of the ilium trending towards the horizontal as seen even stronger in Planicoxa, and the specific name honors Peter Galton.[1] It may be synonymous with Mantellisaurus.[2]


  1. 1.0 1.1 1.2 1.3 (2010) "Early and "Middle" Cretaceous Iguanodonts in Time and Space". Journal of Iberian Geology 36 (2): 145–164. DOI:10.5209/rev_JIGE.2010.v36.n2.3. 
  2. McDonald, Andrew T. (2011). "The status of Dollodon and other basal iguanodonts (Dinosauria: Ornithischia) from the upper Wealden beds (Lower Cretaceous) of Europe". Cretaceous Research 33: 1–6. DOI:10.1016/j.cretres.2011.03.002.