What is Ankylopollexia?
{{Automatic taxobox | fossil_range = [[Late Jurassic]]&ndash;[[Late Cretaceous]], {{Fossil range|156|66}} | image = Isle of Wight Mantellisaurus.jpg | image_caption = ''[[Mantellisaurus]]'' skeleton, [[Natural History Museum, London|Natural History Museum]], London | taxon = Ankylopollexia | authority = [[Paul Sereno|Sereno]], [[1986 in paleontology|1986]] | subdivision_ranks = Subgroups | subdivision = *{{extinct}}''[[Camptosaurus]]'' *{{extinct}}''[[Cumnoria]]'' *{{extinct}}''[[Draconyx]]'' *{{extinct}}''[[Owenodon]]''? *{{extinct}}''[[Uteodon]]'' *{{extinct}}'''Styracosterna''' **{{extinct}}''[[Barilium]]'' **{{extinct}}''[[Bayannurosaurus]]'' **{{extinct}}''[[Cedrorestes]]'' **{{extinct}}''[[Dakotadon]]'' **{{extinct}}''[[Fukuisaurus]]'' **{{extinct}}''[[Hippodraco]]'' **{{extinct}}''[[Hypselospinus]]'' **{{extinct}}''[[Iguanacolossus]]'' **{{extinct}}''[[Lanzhousaurus]]'' **{{extinct}}''[[Lurdusaurus]]'' **{{extinct}}''[[Magnamanus]]'' **{{extinct}}''[[Osmakasaurus]]'' **{{extinct}}''[[Planicoxa]]'' **{{extinct}}''[[Proa valdearinnoensis|Proa]]'' **{{extinct}}''[[Theiophytalia]]'' **{{extinct}}'''Hadrosauriformes''' ***{{extinct}}''[[Bolong]]'' ***{{extinct}}''[[Jinzhousaurus]]'' ***{{extinct}}''[[Ouranosaurus]]'' ***{{extinct}}''[[Morelladon]]'' ***{{extinct}}[[Iguanodontidae]] ***{{extinct}}[[Hadrosauroidea]] }} '''Ankylopollexia''' is an extinct [[clade]] of [[dinosaurs]] within the [[Ornithischia]]. They lived from 156 to 66 million years ago.<ref>McDonald A.T. 2012. Phylogeny of Basal Iguanodonts (Dinosauria: Ornithischia): An Update. ''PLoS ONE'' '''7''' (5): e36745. doi:10.1371/journal.pone.0036745</ref> The name stems from the Greek word, “ankylos”, meaning stiff, fused, and the Latin word, “pollex”, meaning thumb.<ref>Sereno P.C. 1986. Phylogeny of the bird-hipped dinosaurs (order Ornithischia). ''National Geographic Research'' '''2''' (2): 234–56</ref> One of the most famous and most [[derived]] members of the Ankylopollexia clade is the ''[[Iguanodon]]''. The [[Hadrosaur]]s are also in this group