megaceps, Hemigrammus Fowler [H. W.] 1945:1, Fig. 3 [Notulae Naturae (Philadelphia) No. 159; ref. 13141] Ninabamba near Ayacucho, Río Ucayali basin, Peru, elevation 1900 meters. Holotype: ANSP 71624. Paratypes: ANSP 71625 (1), 71626 (1, missing). Type catalog: Böhlke 1984:50 [ref. 13621]. •Valid as Hemigrammus megaceps Fowler 1945 -- (Ortega & Vari 1986:8 [ref. 9708], Barriga Salazar 2014:107 [ref. 35745], Zarske 2015:8 [ref. 33782], Meza-Vargas et al. 2021:18 [ref. 39298]). Current status: Valid as Hemigrammus megaceps Fowler 1945. Acestrorhamphidae: Pristellinae. Distribution: South America: upper Ucayali River basin (Peru and Ecuador). Habitat: freshwater.