nijsseni, Hypopygus de Santana [C. D.] & Crampton [W. G. R.] 2011:1146, Figs. 23B, 29 [Zoological Journal of the Linnean Society v. 163; ref. 31643] Igarapé Repartimento, 1.5 km downstream from Estrada Agrovila, ca. 7 km and 230° from Tefé, muncipality of Tefé, tributary of Lago Tefé, Rio Tefé drainage, 3°24'30"S, 64°44'12"W, Amazonas, Brazil. Holotype: MCP 44650. Paratypes: MCP 44651 (4, 2 c&s), 44737 (4), 44738 (3), 44739 (2), 44740 (1). Type catalog: Ferraris et al. 2017:[27] [ref. 35236]. •Valid as Hypopygus nijsseni de Santana & Crampton 2011 -- (Peixoto et al. 2013:232 [ref. 32780], Ferraris et al. 2017:[27] [ref. 35236], Campos-da-Paz 2018:198 [ref. 35891]). Current status: Valid as Hypopygus nijsseni de Santana & Crampton 2011. Rhamphichthyidae. Distribution: Small streams in vicinity of Tefé, Amazonas, Brazil. Habitat: freshwater.