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More Dinosaur Fact Sheets
Stygimoloch Fact Sheet
Dinosaur/Paleontology Dictionary
NAME: Meaning - Stygimoloch means "demon from the river Styx"
Pronounced - STIJ-eh-MOLL-uk
Named By - Peter M. Galton and Hans-Dieter Sues
When Named - 1983
DIET: Herbivore (plant-eater)
SIZE: Length - 7-10 feet (2-3 m) long
Height - ?
Weight - Very roughly 170 pounds (78 kg)
WHEN IT LIVED: Late Cretaceous period, about 68-65 million years ago
WHERE IT LIVED: Fossils have been found in Montana and Wyoming, USA, North America.
FOSSILS: Stygimoloch is known from 5 partial skulls.
  • Kingdom Animalia (animals)
  • Phylum Chordata (having a hollow nerve chord ending in a brain)
  • Class Archosauria (diapsids with socket-set teeth, etc.)
  • Order Ornithischia - beaked, bird-hipped dinosaurs that were plant-eaters
  • Superfamily Pachycephalosauria - thick-skulled plant-eaters
  • Family Pachycephalosauridae - thick-skulled plant-eaters with a rounded skull
  • Genus Stygimoloch
  • Species S. spinifer (type species named by Galton and Sues, 1983)
Stygimoloch was a thick-skulled plant-eating dinosaur (a pachycephalosaur) that walked on two legs. This unusual-looking dinosaur had bony spikes and bumps on its skull; the many horns ranged up to 4 inches (100 mm) long. Pachycephalosaurs probably engaged in head-butting both as a defense and as intra-species rivalry.

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