Named By: Susumu Tomiya & Zhijie Jack Tseng - 2016.
Synonyms: Miacis cognitus.
Classification: Chordata, Mammalia, Carnivora, Amphicyonidae.
Species: G. cognita (type).
Size: Uncertain due to lack of remains.
Known locations: USA, Texas - Chambers Tuff Formation.
Time period: Late Eocene/Early Oligocene.
Fossil representation: Partial skull.
Originally named as a species of Miacis, Gustafsonia is a genus of small amphicyonid that lived in North America during the Eocene/Oligocene. The amphicyonids are more colloquially known as 'bear dogs’, though Gustafsonia would have likely been more like a civet in form, and a predator of small animals.
- Whence the beardogs? Reappraisal of the Middle to Late Eocene Miacis from Texas, USA, and the origin of Amphicyonidae (Mammalia, Carnivora). - Royal Society Open Science. 3 (10). - Susumu Tomiya & Zhijie Jack Tseng - 2016.