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Named By: Robert R. Reisz in 1972
Time Period: Late Carboniferous, 306 Ma
Location: Canada, Nova Scotia. Czech Republic, Nyrany. USA, Ohio
Size: 50 centimetres long
Diet: unavailable
Fossil(s): Three specimens
Classification: | Chordata | Tetrapoda | Synapsida | Pelycosauria | Ophiacodontidae |

Archaeothyris is an extinct genus of ophiacodontid synapsid that lived during the Late Carboniferous and is known from Nova Scotia. Dated to 306 million years ago, Archaeothyris, along with a more poorly known synapsid called Echinerpeton, are the oldest undisputed synapsids known. Protoclepsydrops also from Nova Scotia is slightly older but is known by very fragmentary materials.

Read more about Archaeothyris at Wikipedia
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