Taxonomic revision of Spectracanthicus Nijssen & Isbrücker (Loricariidae: Hypostominae: Ancistrini), with description of three new species Author Chamon, Carine C. Author Rapp Py-Daniel, Lúcia H. text Neotropical Ichthyology 2014 12 1 1 25 journal article https://doi.org/10.1590/S1679-62252014000100001 10c0936c-f405-4c8d-b34b-9c825f2683a5 1982-0224 4774086 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).