Hemigrammus ataktos Marinho, Dagosta & Birindelli (2013) .

Paratypes: 1 lot, 5 specimens; DZSJRP 18431, 26.2–29.5 mm SL, Natividade, ribeirão da Sede, tributary of ribeirão Formiguinha at Fazenda São Judas, approximately 30 km north of Natividade, Tocantins, Brazil, approximately 11°31’00”S, 47°52’00”W, col. F.C.T. Lima, 2–9 February 1994.