chaoi, Sternarchorhynchus de Santana [C. D.] & Vari [R. P.] 2010:286, Fig. 31 [Zoological Journal of the Linnean Society v. 159 (no. 1); ref. 30785] Rio Jamari, Porto Velho, diversion canal of Usina Hidroeléctica, Samuel (ca. 8°27'S, 63°30'W), Rondônia, Brazil. Holotype: INPA 28357. Paratypes: INPA 20851 (11), USNM 391713 (1). Plus non-type specimens. Type catalog: Ferraris et al. 2017:[12] [ref. 35236]. •Valid as Sternarchorhynchus chaoi de Santana & Vari 2010 -- (Ferraris et al. 2017:[12] [ref. 35236]). Current status: Valid as Sternarchorhynchus chaoi de Santana & Vari 2010. Apteronotidae: Apteronotinae. Distribution: Jamari River basin, Rondônia, Brazil. Habitat: freshwater.