potaroensis, Deuterodon Eigenmann [C. H.] 1909:27 [Annals of the Carnegie Museum v. 6 (no. 1); ref. 1222] Amatuk Cataract, Potaro River, Guyana. Holotype: FMNH 52967 [ex CM 1053]. Paratypes: (8, CM and IU) BMNH 1911.10.31.335 (1); CAS 44230-31 [ex IU 11744-45] (1, 1 not 2); FMNH 52968-69 (1, 1); MCZ 29954 (1). Type catalog: Henn 1928:64 [ref. 12305], Ibarra & Stewart 1987:31 [ref. 12367]. Originally as potaroënsis. •Incertae sedis in Characidae -- (Lucena & Lucena 2002:119 [ref. 26205], [various authors] in Reis et al. 2003:104 [ref. 27061]). •Valid as Deuterodon potaroensis Eigenmann 1909 -- (Taphorn et al. 2022:14 [ref. 41297] tentative in Deuterodon). Current status: Uncertain as Deuterodon potaroensis Eigenmann 1909. Acestrorhamphidae: Stygichthyinae. Distribution: South America: Potaro River basin (Guyana) endemic. Habitat: freshwater.