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Temporal range: Middle – Late Miocene
An artist's illustration of Stirtonia
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Primates
Family: Atelidae
Genus: Stirtonia
Hershkovitz, 1970
  • Kondous Setoguchi, 1985

Stirtonia is the first known howler monkey. It was a large primate for it's time.

Stirtonia had the most developed tail grab of all monkeys and a sharp head. It is believed that, like its modern relatives, could utter a deep, roaring sound to scare off rivals.

Today's howler monkeys mostly eat fruit. Its size is estimated to be around 1.1 metres long (3.6FT) and dating from the rocks where it was found in, was probably from the middle Miocene. Stirtonia's fossils were found in South America.