Comparative material examined. Hemiodus immaculatus Kner ^ZBK, 1858.

NMW 68641, Holotype, 179.2 mm SL, barra do Rio Negro [Brazil, State of Amazonas, City of Manaus]. Non types - Venezuela: Río Orinoco: ANSP 159602, 2/1, 185 mm SL, Rio Sipapo ; ANSP 165434, 1, 87.5 mm SL, Apure; USNM 233616, 16/5, 93.2-128.2 mm SL, beach on S side of river, just E of mouth of Rio Caroni, 8°21’18’’N 62°42’36’’W, Bolivar ; USNM 257529, 1, 134 mm SL, Guarico, Rio Guariquito at government reserve, E-SE of Calabozo, 8°35’N 67°15’W . Brazil: Amazonas: Rio Canuma: MZUSP 7050, 36/6, 147.7-176 mm SL . Rio Japura: MZUSP 36055, 2/1, 175 mm SL, Lago Amana, mouth of river ; MZUSP 36056, 1, 115 mm SL, Igarape Ubi, Lago Amana, mouth of river ; MZUSP 36057, 1, 149.3 mm SL, IgarapeBare, Lago Amana, mouth of river ; MZUSP 36058, 1/0, Igarape Urumatum, Lago Amana, mouth of river . Rio Jutai: MZUSP 21305, 1, 218 mm SL, Riozinho, right margin . Rio Negro: MZUSP 6138, 2/1, 205 mm SL, upstream city of Manaus; MZUSP 6185, 11/3, 190-223 mm SL, Igarape Jaraqui, left margin of the river upstream city of Manaus ; MZUSP 6697, 9/1, 121.7 mm SL, around city of Manaus; MZUSP 9577, 1, 180 mm SL, Manaus fish market; MZUSP 32466, 2/1, 220 mm SL, Rio Arirara, near its mouth . Rio Preto da Eva; MZUSP 6073, 2/0, Manaus . Rio Puraquequara: MZUSP 6089, 4/1, 192 mm SL, Lago Puraquequara, mouth of the river . Pará: Rio Tapajos: MZUSP 9525, 1, 177 mm SL, Alter do Chao; MZUSP 32465, 5/1, 205 mm SL, between Itaituba and Sao Luis ; MZUSP 32467, 1, 195 mm SL, Sao Luis, above Itaituba . Rio Trombetas: MZUSP 5409, 9/3, 180-200 mm SL, Oriximiná; MZUSP 15774 and 15775, 2/1, 247 mm SL, flooded forest of Lago Farias, Biological Reserve of rio Trombetas . Roraima: Rio Negro: MZUSP 32469, 3/0, rio Branco, between its mouth and Xeruini .