AnkylopollexiaCerapodaDinosauriaGenasauriaHadrosauridaeHadrosauriformesHadrosauroideaHadrosauromorphaIguanodontiaLate CretaceousNeornithischiaNorth AmericaOrnithischiaOrnithopodaSaurolophinaeStyracosterna

Thespesius occidentalis

Dinosaur: Thespesius occidentalis

Type: Ornithopod

Length*: 7.9 m 25.9 ft
Weight*: 1.9 tons 4,189 lb
*The largest known specimen

ESR: 1 / 4 (estimated size reliability)


Material: 2 caudal vertebrae and proximal median phalanx of pes.
References: Lull, Richard S.; Wright, Nelda E. (1942). "Hadrosaurian Dinosaurs of North America".


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