Updated 18 March 2024
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Delturus Eigenmann & Eigenmann 1889 delta, fourth letter of Greek alphabet; ourá (Gr. οὐρά), tail, referring to caudal fin, flat above, trenchant below, ∆-shaped in cross section

Delturus angulicauda (Steindachner 1877) angulus (L.), angle or corner; cauda (L.), tail, referring to its tail, which is flat below and trenchant above, its cross sections making a triangular (∆) shape

Delturus brevis Reis & Pereira 2006 Latin for short, referring to smaller maximum size compared with congeners and to comparatively reduced counts of some plates and dorsal-fin rays

Delturus carinotus (La Monte 1933) carina (L.), keel; notus, from nṓtos (Gr. νῶτος), back, referring to five azygous plates between dorsal and adipose fins, which rise to form a keel

Delturus parahybae Eigenmann & Eigenmann 1889 of Rio Paraíba do Sul, Rio de Janeiro state, Brazil, type locality

Hemipsilichthys Eigenmann & Eigenmann 1889 hemi-, from hḗmisys (Gr. ἥμισυς), half, and psilós (Gr. ψιλός), bare, uncovered or smooth, referring to scaleless area behind dorsal fin; ichthýs (Gr. ἰχθύς), fish

Hemipsilichthys gobio (Lütken 1874) etymology not explained, possibly referring to its superficial resemblance (body shape and barbels) to the Gudgeon, Gobio gobio (Cypriniformes: Cyprinidae)

Hemipsilichthys nimius Pereira, Reis, Souza & Lazzarotto 2003 Latin for excessive, referring to 7–9 branched dorsal-fin rays, whereas congeners have seven

Hemipsilichthys papillatus Pereira, Oliveira & Oyakawa 2000 Latin for papillose, referring to distinctly shaped papillae on lower lip