Apart from minor decisions on whether a variety is a language or a dialect, changing names, and not addressing several poorly attested languages, Aikhenvald departs from Kaufman in breaking up the "Southern Outlier" and "Western" branches of Southern Maipurean. She assigns Salumã and Lapachu ('Apolista') to what is left of Southern Outlier ('South Arawak'); breaks up the "Maritime" branch of Northern Maipurean, though keeping Aruán and Palikur together; and is agnostic about the sub-grouping of the "North Amazonian" branch of Northern Maipurean.