Named By: J. J. Head - 1998.
Classification: Chordata, Reptilia, Dinosauria, Ornithischia, Ornithopoda, Iguanodontia, Hadrosauroidea.
Species: P. byrdi (type).
Size: Holotype skull roughly about 70 centimetres long. Total body length roughly estimated at about 7 meters long. Special note*-Holotype individual is of a sub adult, fully grown adults would have been larger than this.
Known locations: USA, Texas - Woodbine Formation.
Time period: Cenomanian of the Cretaceous.
Fossil representation: Skull and partial post cranial remains.
is a genus of medium to large ornithopod dinosaur that lived in North
America during the late Cretaceous. Protohadros
hadrosaur)’, and reflects the idea at the time of its description
that the genus may represent the earliest true hadrosaur
America. However, since Protohadros has been
named, several new
discoveries have now discredited the idea that Protohadros
first. Today Protohadros is usually classed as a
(Hadrosauroidea), meaning that while it was similar and a close
relative of true hadrosaurid (Hadrosauridae) dinosaurs, it was
still too primitive in features to be one.
Protohadros would have been a plant eating dinosaur that mostly walked around on four legs, but could still rear up on just the two hind legs in order to feed on high vegetation, or perhaps run from predators. The main predatory threats to Protohadros would have been predatory dinosaurs such as tyrannosaurs and dromaeosaurs.
- A primitive hadrosaur (Dinosauria: Ornithischia) from the Cenomanian of Texas and its implications for hadrosaurian phylogenetic and biogeographic histories. - Journal of Vertebrate Paleontology 16(3, supplement): 40A. - J. J. Head - 1996.
A new species of basal hadrosaurid (Dinosauria, Ornithischia) from the Cenomanian of Texas. - Journal of Vertebrate Paleontology 18(4):718-738 - J. J. Head - 1998.