Istiorachis
Videos
Istiorachis is an extinct genus of iguanodontian ornithopod dinosaur from the Early Cretaceous Wessex Formation of the Isle of Wight, England. The genus contains a single species, Istiorachis macarthu
Holotype tail vertebrae with elongated neural spines
Speculative life restoration
Ankylopollexia
Videos
Ankylopollexia is an extinct clade of ornithischian dinosaurs that lived from the Late Jurassic to the Late Cretaceous. It is a derived clade of iguanodontian ornithopods and contains the subgroup Sty
Life restoration of Iguanacolossus
Hand of Iguanodon, showing the distinctive thumb of the group
Brain endocast of an Iguanodon, created in 1897 from specimen NHMUK R2501
A 1905 diagram showing the small size of an Edmontosaurus annectens brain (bottom; alongside that of Triceratops horridus, top) commented on in early sources