dˌɪnəsˈɔːɹəmˌoːɹfz ɐpˈɪɹd pjˈuːɾətˌɪvli ɚɹˈaʊnd tˈuːhˈʌndɹɪd fˈoːɹɾi tˈuː tə tˈuːhˈʌndɹɪd fˈoːɹɾi fˈoːɹ mˈɪliən jˈɪɹz ɐɡˈoʊ baɪ ðɪ ænˈɪʒən stˈeɪdʒ ʌvðə mˈɪdəl tɹaɪˈæsɪk, splˈɪɾɪŋ fɹʌm ˈʌðɚɹ ˈɔːɹnɪθˌɑːdaɪɚz.
Dinosauromorphs appeared putatively around 242 to 244 million years ago by the Anisian stage of the Middle Triassic, splitting from other ornithodires.