ɪts ɹᵻmˈeɪnz wɜː fˈaʊnd ɪnðə stˈɛɹweɪ sˈændstoʊn nˌɪɹ ˈælɪs spɹˈɪŋz, ɔːstɹˈeɪliə ɪn nˈaɪntiːnhˈʌndɹɪd fˈɪfti nˈaɪn, bˌʌt ɪt wʌz nˌɑːt dɪtˈɜːmɪnd ðæt ðeɪ wɜː ðɪ ˈoʊldɪst nˈoʊn vˈɜːɾɪbɹˌeɪts ʌntˈɪl ðə lˈeɪt nˈaɪntiːnhˈʌndɹɪd sˈɪksti z.
Its remains were found in the Stairway Sandstone near Alice Springs, Australia in 1959, but it was not determined that they were the oldest known vertebrates until the late 1960s.