Redescription of Parancistrus aurantiacus (Castelnau, 1855) and preliminary establishment of two new genera: Baryancistrus and Oligancistrus (Siluriformes, Loricariidae)
The type-species of the genus Parancistrus, P. aurantiacus (Castelnau, 1855), is redescribed based on type and non-type material. Regan’s proposal (1904) that Parancistrus nigricans (Castelnau, 1855) and Parancistrus vicinus (Castelnau, 1855) are synonyms of Parancistrus aurantiacus is confirmed based on the reexamination of the three types. Other species hitherto assigned to Parancistrus, such as P. niveatus (Castelnau, 1855) and P. punctatissimus (Steindachner, 1881) are allocated to two new genera Baryancistrus and Oligancistrus herein preliminary established. The genus Parancistrus Bleeker, 1862, comprises now only one species: P. aurantiacus.