Atreipus

Atreipus is an ichnogenus of trace fossil attributed to theropod dinosaurs. ...
Found on http://en.wikipedia.org/wiki/Atreipus

Atreipus

(pronounced ah-TREE-ih-pus) Atreipus is a poorly-known ornithischian (bird-hipped) dinosaur known only from its fossilized tracks. No fossilized bones have been attributed to this ichnogenus. Two sizes of footprints (4.5 and 1 cm long) have been found in conjunction, indicating that this small dinosaur walked on four legs and its rear legs were muc...
Found on http://www.enchantedlearning.com/subjects/dinosaurs/glossary/
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