mulleri, Rhamphichthys Kaup [J. J.] 1857:129, Fig. 4 [Catalogue of the apodal fish in the collection of the British Museum; ref. 2573] Cayenne, French Guiana. Syntypes: (2) MNHN 0000-3983 (1). Type catalog: Ferraris et al. 2017:[25] [ref. 35236]. •Valid as Hypopomus mulleri (Kaup 1857) -- (Ortega & Vari 1986:13 [ref. 9708] as muelleri, Hopkins 1991:155 [ref. 19506], Mago-Leccia 1994:47 [ref. 21320] as muelleri). •Synonym of Hypopomus artedi (Kaup 1857) -- (Albert & Crampton in Reis et al. 2003:495 [ref. 27061], Ferraris et al. 2017:[25] [ref. 35236]). Current status: Synonym of Hypopomus artedi (Kaup 1857). Hypopomidae. Habitat: freshwater.