name = "Parancistrus"
phylum = Chordata
ordo = Siluriformes
genus = "Parancistrus"
genus_authority = Bleeker, 1862
type_species = "Hypostomus aurantiacus"
type_species_authority = Castelnau, 1855
subdivision_ranks = Binomial name
Rapp Py-Daniel and Zuanon, 2005
synonyms = "Acanthodemus" Marschall, 1873
"Parancistrus" is a small
genusof catfishes (order Siluriformes) of the family Loricariidae. It includes two species, "P. aurantiacus" and "P. nudiventris". [cite journal|url=http://silurus.acnatsci.org/ACSI/library/biblios/2007_Ferraris_Catfish_Checklist.pdf|title=Checklist of catfishes, recent and fossil (Osteichthyes: Siluriformes), and catalogue of siluriform primary types|first=Carl J., Jr.|last=Ferraris|journal= Zootaxa|volume=1418|pages=1–628|year=2007|format=
The three species "Hypostomus aurantiacus", "H. nigricans", and "H. vicinus" were described by
François Louis de la Porte, comte de Castelnauin 1855.cite web|url=http://www.auburn.edu/academic/science_math/res_area/loricariid/fish_key/Paran/Paran.html|title=Parancistrus|first=Jonathan W.|last=Armbruster|accessdate=2007-06-01] "Parancistrus" was described by Pieter Bleekerin 1862 and "P. aurantiacus" designated as type.FishBase genus|genus=Parancistrus|year=2007|month=June] Later, "P. nigricans" and "P. vicinus" were deemed to be synonyms of "P. aurantiacus", making "P. aurantiacus" the only species of "Parancistrus" until "P. nudiventris" was described in 2005.
"P. aurantiacus" is found in the Ucayali, Tocantins and
Xingu Rivers.FishBase species|genus=Parancistrus|species=aurantiacus|year=2007|month=June] "P. nudiventris" is found in the Xingu River in Brazil.FishBase species|genus=Parancistrus|species=nudiventris|year=2007|month=June]
Appearance and anatomy
"Parancistrus" is unique among loricariids due to the presence of fleshy folds on the naked area around the
dorsal finand at the pectoral finpoints insertion in the breeding males. Breeding males also have elongated odontodes on their bodies and pectoral fin spines.
"Parancistrus" have stout bodies that are completely plated in adults. The dorsal fin membrane connects to the
adipose finspine. Their color is typically slate gray to black, occasionally with white streaks. They have large gillopenings, which makes the genus different from all other loricariids except some " Pogonopoma" and " Rhinelepis".
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