fˌaɪloʊdʒnˈɛɾɪk ˈænɐlˌaɪzᵻz pˈʌblɪʃt dˈʊɹɹɪŋ ðə tˈuː θˈaʊzənd z kˈæst dˈaʊt ɔnðɪ aɪdˈiə ðæt mˈɛni tɹɐdˈɪʃənəl mˈɛtɹɪɹhˌɪntʃɪd dʒˈɛnɚɹə fˈɔːɹmd nˈætʃɚɹəl ɡɹˈuːps ˈaɪ.ˈiː., ɪŋklˈuːd ˈɔːl dᵻsˈɛndənts əvə kˈɑːmən ˈænsɛstɚ.
Phylogenetic analyses published during the 2000s cast doubt on the idea that many traditional metriorhynchid genera formed natural groups (i.e., include all descendants of a common ancestor).