Joshua Birchall and Michael Dunn and Simon Greenhill 2016
Urupa, an extinct Chapacuran language, is missing from E16/E17/E18/E19/E20/E21/E22/E23/E24/E25/E26/E27 ( Curt Nimuendajú 1925 , Curt Nimuendajú and do Valle Bentes, Euclydes Henrique 1923 ).