However the emerging consensus is that they likely originated from temnospondyls, the most diverse group of prehistoric amphibians, during the Permian period.
haʊˈɛvɚ ðɪ ɪmˈɜːdʒɪŋ kənsˈɛnsəs ɪz ðæt ðeɪ lˈaɪkli ɚɹˈɪdʒᵻnˌeɪɾᵻd fɹʌm tˈɛmnəspˌɑːndɪlz, ðə mˈoʊst daɪvˈɜːs ɡɹˈuːp ʌv pɹˌiːhɪstˈɔːɹɪk æmfˈɪbiənz, dˈʊɹɹɪŋ ðə pˈɜːmiən pˈiəɹɪəd.