muelleri, Sternarchus (Rhamphosternarchus) Steindachner [F.] 1881:99 [Anzeiger der Akademie der Wissenschaften in Wien, Mathematisch-Naturwissenschaftliche Klasse v. 18 (no. 11) (for 5 May 1881); ref. 20484] Amazon River near Pará, Brazil. Lectotype: NMW 65328:1. Paralectotypes: (several) NMW 65328 (1). Type catalog: Ferraris et al. 2017:[12] [ref. 35236]. Species originally spelled as Mülleri, change mandatory; later illustrated and described in more detail in Steindachner 1881:15, Pl. 5 (fig. 4) [ref. 14299]. Not the same as Sternarchus mulleri Castelnau 1855, and probably preoccupied by Castelnau's mulleri. •Valid as Sternarchorhamphus muelleri (Steindachner 1881) -- (Ortega & Vari 1986:12 [ref. 9708], Mago-Leccia 1994:36 [ref. 21320], Albert & Campos-da-Paz 1998:429 [ref. 23853], Albert 2001:112 [ref. 25614], Albert in Reis et al. 2003:500 [ref. 27061], Proudlove 2006:269 [ref. 28992], Barriga Salazar 2014:116 [ref. 35745], DoNascimiento et al. 2017:68 [ref. 35633], Ferraris et al. 2017:[12] [ref. 35236], Bernt et al. 2018:475 [ref. 35797], Meza-Vargas et al. 2021:21 [ref. 39298], Taphorn et al. in Lasso & Morales-Betancourt 2022:80 [ref. 40783], Torgersen et al. 2023:777 [ref. 40692]). Current status: Valid as Sternarchorhamphus muelleri (Steindachner 1881). Apteronotidae: Sternarchorhamphinae. Distribution: South America: Amazon River basin (Brazil, Ecuador, Colombia, Peru and Venezuela). Habitat: freshwater.