"Before Saurolophus"

Prosaurolophus (Greek - before saurolophus), was a terrestrial dinosaur genus of hadrosaurids (known as duck-billed dinosaurs because of the similarity of their heads to those of modern ducks). Prosaurolophus occurred in the late Cretaceous period. It is most distinguished by its long, broad skull and a small crest near the eyes. This crest rose like spines above both eyes and was directed backward. Prosaurolophus is the earliest known flat-topped hadrosaur.

Whether Prosaurolophus was really an ancestor of Saurolophus,
is disputed among scientists.

Prehistoric EraMiddle to Upper Campanian (Upper Cretaceous)
SpeciesProsaurolophus maximus, Prosaurolophus blackfeetensis
Height4.3 meter
Length8 - 9 meter
Weight4.5 tons
TerritoryNorthamerica, Canada
Prosaurolophus Größenvergleich
Größenvergleich Prosaurolophus - Mensch

image source: I, Steveoc 86, CC BY 3.0, via Wikimedia Commons

Size comparison: Slate Weasel, Public domain, via Wikimedia Commons

Skull: Rémih, CC BY-SA 3.0, via Wikimedia Commons

Skeleton: Daderot, CC0, via Wikimedia Commons

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