In a study that represents the first lexicostatistical classification of the Austronesian languages, Isidore Dyen (1965) presented a radically different subgrouping scheme. He posited 40 first-order subgroups, with the highest degree of diversity found in the area of Melanesia. The Oceanic languages are not recognized, but are distributed over more than 30 of his proposed first-order subgroups. Dyen's classification was widely criticized and for the most part rejected, but several of his lower-order subgroups are still accepted (e.g. the Cordilleran languages, the Bilic languages or the Murutic languages).