These are Ascaphidae, Bombinatoridae, Discoglossidae and Leiopelmatidae which have few derived features and are probably paraphyletic with regard to other frog lineages.
ðiːz ɑːɹ ɐskˈæfɪdˌiː, bˈɑːmbɪnˌæɾoːɹˌɪdiː, dɪskˈɑːɡlɔsˌɪdiː ænd lˈeɪoʊplmˌæɾɪdˌiː wˌɪtʃ hæv fjˈuː dᵻɹˈaɪvd fˈiːtʃɚz ænd ɑːɹ pɹˈɑːbəbli pˌæɹəfaɪlˈɛɾɪk wɪð ɹᵻɡˈɑːɹd tʊ ˈʌðɚ fɹˈɑːɡ lˈɪnɪɪdʒᵻz.