ˈɔːl sˈɛfɐləpˌɑːdz wɪð ɛkstˈɜːnəl ʃˈɛlz ɛksˈɛpt ðə nˈɔːɾɪlˌɔɪdz bɪkˌeɪm ɛkstˈɪŋkt baɪ ðɪ ˈɛnd ʌvðə kɹɛtˈeɪʃəs pˈiəɹɪəd .
All cephalopods with external shells except the nautiloids became extinct by the end of the Cretaceous period .