Bactrosaurus johnsoni

† Bactrosaurus johnsoni was a Late Cretaceous lambeosaurine hadrosaur from the Iren Dabasu Formation of Inner Mongolia. This large herbivore, approximately 7 m long, is one of the oldest known hadrosaurs and was first described in 1933 by Charles Gilmore. Its primitive features illuminate the transition from iguanodontian ancestry to the derived duck-billed dinosaur body plan.

Diet & Feeding

Herbivore

Bactrosaurus johnsoni 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

Cretaceous Late Mesozoic Era

Bactrosaurus johnsoni lived during the Cretaceous Late period of the Mesozoic Era, approximately 100.5 to 66.0 million years ago.

The final age of dinosaurs, featuring iconic species like Tyrannosaurus rex, Triceratops, and Velociraptor. Dinosaurs reached their peak diversity before the catastrophic asteroid impact at the Chicxulub crater ended the Mesozoic Era.