Abstract
ABSTRACT A new species of Ancistrus is described from minor tributaries of the río Madre de Dios basin (Cusco - Madre de Dios - Puno), in Peru. The new species shares with A. greeni an uncommon unicusp dentition; but it is distinguished from A. greeni by a larger orbital diameter, deeper caudal peduncle, and larger adipose-fin spine. The redescription of A. greeni is provided, and its recognition along with the discovery of this new species increases to five the officially number of Ancistrus species from the río Madre de Dios basin. The lectotype and paralectotype of A. greeni are provided.
Highlights
Loricariidae is the largest family of the Siluriformes in the Neotropics
Three valid species are recognized from the río Madre de Dios basin: Ancistrus marcapatae (Regan, 1904), A. megalostomus Pearson, 1924, and A. montanus (Regan, 1904) (Bifi et al, 2019)
Ancistrus greeni is diagnosed from A. maldonadoi by smaller eye; a slender caudal peduncle; smaller adiposefin spine
Summary
Loricariidae is widespread in Central and South America, ranging from Costa Rica in the north to Argentina in the south (Weber, 2003). Three valid species are recognized from the río Madre de Dios basin: Ancistrus marcapatae (Regan, 1904), A. megalostomus Pearson, 1924, and A. montanus (Regan, 1904) (Bifi et al, 2019). Regan (1904) described Chaetostomus maculatus from Rozmaiu, Upper Peru, but this type locality has never been found under that name. According to Fish-Muller (2003) “Rozmaiu“ means Roz River in Quechua idiom, a language spoken by indigenous people living in Peru, Ecuador, Bolivia, Chile, Colombia and Argentina. Chaetostomus maculatus is only known from syntypes and its geographical distribution remains unknown, solely mentioned as río Roz basin (Fish-Muller, 2003)
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