Altona Kaup [J. J.] in Duméril 1856:201 Fem. Gymnotus rostratus Linnaeus 1766. Type by monotypy. Not available, no description or indication; in list of genera and species as "Altona rostrata." Presumed to refer to Gymnotus rostratus Linnaeus and therefore in synonymy of Rhamphichthys Müller & Troschel 1846. •In the synonymy of Rhamphichthys Müller & Troschel 1846 -- (Mago-Leccia 1994:40 [ref. 21320], Ferraris in Reis et al. 2003:492 [ref. 27061], Ferraris et al. 2017:[28] [ref. 35236] with author as Duméril, Carvalho & Albert 2023:6 [ref. 40654]). Nomen Nudum. Current status: Synonym of Rhamphichthys Müller & Troschel 1846. Rhamphichthyidae.