AnkylopollexiaCerapodaDinosauriaGenasauriaHadrosauridaeHadrosauriformesHadrosauroideaHadrosauromorphaIguanodontiaLate CretaceousNeornithischiaNorth AmericaOrnithischiaOrnithopodaSaurolophinaeStyracosterna

Thespesius occidentalis

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Dinosaur: Thespesius occidentalis

Cretaceous: 72.1–66 Ma
Type: Ornithopod

Length*:7.9 m25.9 ft
Weight*:1.9 t4,189 lb
ESR: 1 / 4 (estimated size reliability)
*The largest known specimen



Sources

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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