DinosauriaEurypodaGenasauriaLate JurassicNorth AmericaOrnithischiaStegosauriaStegosauridaeStegosaurinaeThyreophora

Hesperosaurus mjosi

Dinosaur: Hesperosaurus mjosi

Type: Stegosaur

Length*: 7 m 23.0 ft
Weight*: 2.6 tons 5,732 lb
*The largest known specimen

ESR: 3 / 4 (estimated size reliability)


Material: At least several individuals (partial skeletons with skulls).
References: Maidment, S. C. R., Woodruff, D. C., & Horner, J. R. (2018). A new specimen of the ornithischian dinosaur Hesperosaurus mjosi from the Upper Jurassic Morrison Formation of Montana, U.S.A., and implications for growth and size in Morrison stegosaurs.


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