ɹˈɑːdʒɚ blˈɛntʃ tˈuː θˈaʊzənd nˈaɪn ˈɔːlsoʊ pɹəpˈoʊzᵻz ðæt ðɛɹ mˌaɪthɐv bˌɪn ˈʌðɚ pɹˈaɪmɚɹi bɹˈæntʃᵻz ʌv ˌɔːstɹoʊsɪˈæɾɪk ðæt ɑːɹ nˈaʊ ɛkstˈɪŋkt, bˈeɪst ˌɔn sˈʌbstɹeɪt ˈɛvɪdəns ɪn mˈɑːdɚndˈeɪ lˈæŋɡwɪdʒᵻz.
Roger Blench (2009) also proposes that there might have been other primary branches of Austroasiatic that are now extinct, based on substrate evidence in modern-day languages.