Spectracanthicus Nijssen & Isbrücker, 1987

Spectracanthicus Nijssen & Isbrücker, 1987: 93 . Type species: Spectracanthicus murinus Nijssen & Isbrücker, 1987 by original designation and monotypy. Gender masculine.

Oligancistrus Rapp Py-Daniel, 1989: 246 . Type species: Chaetostomus punctatissimus Steindachner, 1881 by original designation and monotypy. Gender masculine.

Diagnosis. Spectracanthicus is diagnosed from all other Ancistrini, except Baryancistrus niveatus and B. beggini, and Parancistrus by the presence of an expansion of dorsal-fin membrane connecting the last dorsal-fin ray of to the adipose-fin spine (vs. dorsal fin not expanded and connected to adipose). Spectracanthicus is distinguished from Baryancistrus by having up to 25 teeth on premaxilla (vs. more than 25); and from Parancistrus by having small gill opening, reaching up to 1 / 3 of cleithrum length (vs. large gill opening, reaching nearly 1 / 2 of cleithrum length).