keɪsˈɑːpsɪs lˈɪvd ɪnðə lˈeɪt ˈɜːli pˈɜːmiən ˈɛpɑːk kʌŋɡjˈʊɹɹiən ˈeɪdʒ, bᵻfˌoːɹ ðə pɛlˈɪkəsˌɔːɹz wɜː ɹᵻplˈeɪst baɪ ðə mˈoːɹ ɐdvˈænst θˈɛɹəpsˌɪdz ɪnðə nˈɛkst ˈeɪdʒ.
Caseopsis lived in the late Early Permian epoch (Kungurian Age), before the pelycosaurs were replaced by the more advanced therapsids (in the next age).