sexlineatus, Nematocentris Munro [I. S. R.] 1964:162, Fig. 7 [Papua New Guinea Agricultural Journal v. 16 (no. 4); ref. 3058] Upper Fly River, Papua New Guinea. Holotype: AMS I.20726-001 [ex IA.7248 in part]. Paratypes: AMS IA.5876 (6), IA.7246 (1), IA.7247 (1), IA.7248 (1), IA.7249 (6); CSIRO B 340 (1). •Valid as Nematocentris sexlineata Munro 1964 -- (Roberts 1978:49 [ref. 8886]). •Valid as Melanotaenia sexlineata (Munro 1964) -- (Allen 1991:95 [ref. 21090], Allen 1996:11 [ref. 22218], Allen et al. 2008:95 [ref. 30265], Allen & Hadiaty 2011:602 [ref. 31351], Allen et al. 2015:103 [ref. 33750], Graf et al. 2015:870 [ref. 33836], Hammer et al. 2019:212 [ref. 37131], Graf et al. 2023:2067 [ref. 40721]). Current status: Valid as Melanotaenia sexlineata (Munro 1964). Melanotaeniidae. Distribution: New Guinea: upper Fly River system, Papua New Guinea. Habitat: freshwater.