Ankylopollexia

†Ankylopollexia is a clade of ornithopod dinosaurs characterised by a fused or immobile thumb (pollex), first identified in the Late Jurassic of Portugal. This group includes iguanodontians and their relatives, representing the lineage that gave rise to the diverse and abundant herbivores that dominated Cretaceous ecosystems worldwide.

Diet & Feeding

Herbivore

Ankylopollexia was a plant-eating dinosaur. Herbivores typically fed on ferns, cycads, conifers, and other vegetation available during their era. Many herbivorous dinosaurs developed specialized teeth and digestive systems for processing tough plant material.

Time Period

Jurassic Late Mesozoic Era

Ankylopollexia lived during the Jurassic Late period of the Mesozoic Era, approximately 161.5 to 145.0 million years ago.

One of the most iconic periods for dinosaurs. Giant sauropods like Brachiosaurus and Diplodocus roamed alongside predators like Allosaurus. Archaeopteryx, the earliest known bird, appeared. The Morrison Formation preserves an extraordinary fossil record from this time.