ðɪs dˌɛfɪnˈɪʃən wʌz ɪntˈɛndᵻd tə kˌɔːɹɪspˈɑːnd tʊ ɐ klˈeɪd ɪŋklˈuːdɪŋ lˈædʒɚpˌɛɾɪdz ænd kɹˈaʊnwɚd bˈɜːdlˈaɪn ˌɑːɹtʃˈɑːsɔːɹz, bˌʌt nˌɑːt tˈɛɹəsˌɔːɹz ɔːɹ ˈʌðɚɹ ˌɑːɹtʃˈɑːsɔːɹz.
This definition was intended to correspond to a clade including lagerpetids and crownward bird-line archosaurs, but not pterosaurs or other archosaurs.