Archaeothyris is an extinct genus of ophiacodontid synapsids 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.
The name means ancient window (Greek), and refers to the opening in the skull, the temporal fenestra, which indicates this is an early synapsid.
Protoclepsydrops also from Nova Scotia is slightly older but is known by very fragmentary materials.
Archaeothyris is an extinct genus of ophiacodontid synapsids 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. The name means ancient window (Greek), and refers to the opening in the skull, the temporal fenestra, which indicates this is an early synapsid. Protoclepsydrops also from Nova Scotia is slightly older but is known by very fragmentary materials.
Archaeothyris