Ankylopollexia

Ankylopollexia Temporal range: Late Jurassic–Late Cretaceous,
Mantellisaurus skeleton, Natural History Museum, London
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Order:	†Ornithischia
Suborder:	†Ornithopoda
Clade:	†Dryomorpha
Clade:	†Ankylopollexia Sereno, 1986
Subgroups
†Camptosaurus †Cumnoria †Draconyx †Owenodon? †Uteodon †Styracosterna †Barilium †Bayannurosaurus †Cedrorestes †Dakotadon †Fukuisaurus †Hippodraco †Hypselospinus †Iguanacolossus †Lanzhousaurus †Lurdusaurus †Magnamanus †Osmakasaurus †Planicoxa †Proa †Theiophytalia †Hadrosauriformes †Bolong †Jinzhousaurus †Ouranosaurus †Morelladon †Iguanodontidae †Hadrosauroidea

Ankylopollexia is an extinct clade of dinosaurs within the Ornithischia. They lived from 156 to 66 million years ago.

One of the most famous and most derived members of the Ankylopollexia clade is the Iguanodon. The Hadrosaurs are also in this group.

The name stems from the Greek word “ankylos” (meaning stiff or fused) and the Latin word “pollex”, meaning thumb.