1. Education
You can opt-out at any time. Please refer to our privacy policy for contact information.




Monolophosaurus (Wikimedia Commons)


Monolophosaurus (Greek for "single-crested lizard"); pronounced MON-oh-LOAF-oh-SORE-us


Woodlands of Asia

Historical Period:

Middle Jurassic (170 million years ago)

Size and Weight:

About 17 feet long and 1,500 pounds



Distinguishing Characteristics:

Bipedal stance; single crest on head


About Monolophosaurus:

Unlike its similarly named cousin, Dilophosaurus, Monolophosaurus hasn't quite seized the public's imagination--even though this allosaur (as it has tentatively been classified) was slightly bigger than Dilophosaurus and probably more dangerous. Like all theropods, Monolophosaurus was a meat-eating biped; judging by geological clues from where it was discovered, it likely prowled the lakebeds and riversides of middle Jurassic Asia. Why did Monolophosaurus have that single, prominent crest on top of its head? As with all such anatomical features, this was likely a sexually selected characteristic--that is, males with bigger crests were dominant in the pack and could more easily mate with females.


©2014 About.com. All rights reserved.