plˌeɪɾəsˈɔːɹɪdˌiː, wˌɪtʃ wʌz fˈɜːst nˈeɪmd baɪ ˈɑːθnjəl tʃˈɑːɹlz mˈɑːɹʃ ɪn wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd nˈaɪnti fˈaɪv, ɪz ɐ stˈɛmbˈeɪst tˈæksən ænd ɪt wʌz dᵻfˈaɪnd baɪ sɛɹˈɛnoʊ, nˈaɪntiːnhˈʌndɹɪd nˈaɪnti ˈeɪt æz ˈɔːl ˈænɪməlz mˈoːɹ klˈoʊsli ɹᵻlˈeɪɾᵻd tə plˌeɪɾəsˈɔːɹəs ˈɛndʒɪlhˌɑːɹdti ðɐn tə mˈæsəspˌɑːndɪləs kˈæɹɪnˌæɾəs.
Plateosauridae, which was first named by Othniel Charles Marsh in 1895, is a stem-based taxon and it was defined by Sereno, 1998 as all animals more closely related to Plateosaurus engelhardti than to Massospondylus carinatus.