platycephalum, Megalonema Eigenmann [C. H.] 1912:150, Fig. 31, Pl. 10 (fig. 2) [Memoirs of the Carnegie Museum v. 5 (no. 1); ref. 1227] Tumatumari, Guyana. Holotype: FMNH 53224 [ex CM 1684]. Paratypes: (4) FMNH 53225 [?ex CM 1685a; IU 12060] (2), CAS 75768 [ex IU 12060] (2). Type catalog: Henn 1928:76 [ref. 12305], Ibarra & Stewart 1987:55 [ref. 12367], Ferraris 2007:335 [ref. 29155]. Appeared first as name only in Eigenmann 1910:383 [ref. 1224] •Valid as Megalonema platycephalum Eigenmann 1912 -- (Burgess 1989:275 [ref. 12860], Galvis et al. 1997:61 [ref. 23651], Le Bail et al. 2000:94 [ref. 24549] as cf. platycephalum, Ferraris 2007:335 [ref. 29155], Barriga Salazar 2014:114 [ref. 35745], Sarmiento et al. 2014:192 [ref. 35004], DoNascimiento et al. 2017:93 [ref. 35633], Urbano-Bonilla et al. 2018:80 [ref. 35773], Grant 2021:76 [ref. 38702], Meza-Vargas et al. 2021:23 [ref. 39298], Lasso et al. in Lasso & Morales-Betancourt 2022:238 [ref. 40783], Taphorn et al. 2022:55 [ref. 41297]). Current status: Valid as Megalonema platycephalum Eigenmann 1912. Pimelodidae. Distribution: South America: Amazon, Essequibo and Orinoco River basins (Bolivia, Brazil, Colombia, Ecuador, Guyana, Peru and Venezuela). Habitat: freshwater.