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Temporal range: Early Jurassic
Holotype jaw
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: Ornithischia
Genus: Geranosaurus
Broom 1911

Geranosaurus (meaning "sloth reptile") is a genus of ornithischian dinosaur from the Early Jurassic. It is known only from a jaw bone and limb elements discovered in the Clarens Formation, South Africa. Because of the limited remains, it is considered a nomen dubium. It is classified as an ornithischian based on the jaw, probably a heterodontosaurid.

The type species, Geranosaurus atavus, was described by Robert Broom in 1911.[1] The genus name is derived from Greek geranos, "sloth", a reference to the sloth-like hind-limb. The specific name means "ancestor" in Latin. The limb elements have inventory number SAM 1871.


  1. ^ R. Broom, 1911, "On the dinosaurs of the Stormberg, South Africa", Annals of the South African Museum 7(4): 291-308