AnkylopollexiaCerapodaDinosauriaGenasauriaHadrosauriformesHadrosauroideaHadrosauromorphaIguanodontiaLate CretaceousNeornithischiaNorth AmericaOrnithischiaOrnithopodaStyracosterna

Protohadros byrdi 

Dinosaur: Protohadros byrdi 

Type: Ornithopod

Length*: 7.5 m 24.6 ft
Weight*: 2.4 tons 5,291 lb
*The largest known specimen

ESR: 2 / 4 (estimated size reliability)


Material: Skull and fragments. Referred teeth, skeletons ?
References: Head J.J. (1998). "A new species of basal hadrosaurid (Dinosauria, Ornithopoda) from the Cenomanian of Texas".


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