caatingaensis, Gymnotus carapo Craig [J. M.], Crampton [W. G. R.] & Albert [J. S.] 2017:427, Fig. 3B [Zootaxa 4318 (no. 3); ref. 35568] Río Gurgueia aff. Río Parnaíba, Piauí, Brazil, 08°32'24"S, 44°25'48". Holotype: AUM 20624. Paratypes: AUM. Plus additional non-type material. •Synonym of Gymnotus carapo Linnaeus 1758. Current status: Synonym of Gymnotus carapo Linnaeus 1758. Gymnotidae: Gymnotinae. Distribution: Caatinga ecoregion, Parnaíba basin, northeastern Brazil (if treated as a valid subspecies). Habitat: freshwater.