pɹˈɑːmɪssəm ɪz ɐn ɛkstˈɪŋkt dʒˈɛnəs ʌv kənˈɑːdɔnts, pɹˈɪmᵻtˌɪv kˈɔːɹdeɪts, ðæt lˈɪvd dˈʊɹɹɪŋ ðɪ ˌʌpɚɹ ˌɔːɹdəvˈɪʃən pˈiəɹɪəd.
Promissum is an extinct genus of conodonts, primitive chordates, that lived during the Upper Ordovician period.