Dinosaurs A to Z
Hadrosauridae

Tetragonosaurus te-tra-GO-no-SOR-us

Generic ornithopod body-plan outline
You 1.8 m (5.9 ft) tall
Tetragonosaurus 9 m (29.5 ft) long
as long as 6 people standing fingertip to fingertip
generic ornithopod body plan, scaled to length — not a silhouette of Tetragonosaurus
Length
9 m (29.5 ft)
Period
Late Cretaceous (83.6–72.2 Mya)
Food
Herbivore
Clade
Hadrosauridae Dinosauria Ornithischia Cerapoda Ornithopoda Iguanodontia Duck-billed dinosaurs with tooth batteries.

Tetragonosaurus is a hadrosauridae known from the Cretaceous period, of uncertain origin. Most of what’s published comes from a small number of specimens, and the fuller picture of how it lived is still being worked out.

What we know

  • Originally named by Parks 1931.