Ophiacodontidae is an extinct family of early eupelycosaurs from the Carboniferous and Permian. Archaeothyris, and Clepsydrops were among the earliest ophiacodontids, appearing in the Late Carboniferous.
In terms of fossil records, Ophiacodontidae is a lineage of early eupelycosaurs that lived during the Carboniferous and Permian periods. Archaeothyris and Clepsydrops are among the earliest known ophiacodontids, appearing in the Late Carboniferous.