castor, Hippopotamyrus Pappenheim [P.] 1906:260 [Sitzungsberichte der Gesellschaft Naturforschender Freunde zu Berlin 1906 (no. 10); ref. 3360] Lokundi River near Bipindi, Cameroon. Syntypes: BMNH 1907.12.3.2 [ex ZMB] (1), ZMB 15199 (now 1). •Valid as Hippopotamyrus castor Pappenheim 1906 -- (Myers 1960:124 [ref. 3128], Gosse 1984:74 [ref. 6169], Bigorne in Lévêque et al. 1990:150 [ref. 21589], Hopkins et al. 2007:291 [ref. 30019], Kramer & Swartz 2010:2229 [ref. 30915], Kramer & van der Bank 2011:2692 [ref. 31546], Fermon et al. 2022:123 [ref. 39448]). Current status: Valid as Hippopotamyrus castor Pappenheim 1906. Mormyridae. Distribution: West-central Africa: Cameroon south to Ntem basin (Gabon). Habitat: freshwater.