Can be distinguished from P.
by having a naked abdomen (plated in P. aurantiacus),
the presence of bluish dots in living specimens or
spotted in preserved specimens (uniformly dark or
clear brown or mottled, never spotted in P. aurantiacus),
larger interbranchial distance (39-56% in HL vs. 24.9-39.5%
in P. aurantiacus), narrower interorbital
distance (26.8-38% in HL vs. 38.5-43.1% in P.
aurantiacus). Parancistrus nudiventris
also has buccal teeth more conspicuous than in P.
aurantiacus. Main skeletal differences include
the presence of a strong condyle on the lateral ethmoid
for articulation with the metapterygoid in P.
nudiventris (not seen in P. aurantiacus);
anguloarticular processes short in P. nudiventris
(long in P. aurantiacus); opercle with odontodes,
partly exposed in P. nudiventris (completely
embedded in skin in P. aurantiacus). This
genera have a broad and flattened body with large
scutes. The dorsal and adipose fin is connected with
a membrane and they have very large gill openings.
Aquarium Care: Only fairly territorial
while youngsters prefer to rest under pieces of wood
and on to rockwork. Adults rest on the substrate in
hiding places. Sexual Differences:
Males posses a broader head and more strongly bristled
pectoral spines. The bristles on the posterior of
the males scutes are elongated when sexually mature.
Diet: Omnivore. A varied diet with
both vegetable and other foods such as tablet, live
Rio Xingu. Type locality: Brazil;
Pará State; rio Xingu, bedrock at ilha do Bacabal,
3º23'19" S, 51º43'24".
Ferraris, C.J. Jr.,
2007. Checklist of catfishes, recent and fossil (Osteichthyes:
Siluriformes), and catalogue of siluriform primary
types. Zootaxa 1418:1-628. Rapp Py-Daniel, L.H.
and J. Zuanon 2005
Description of a new species of Parancistrus (Siluriformes:
Loricariidae) from the rio Xingu, Brazil. Neotrop.
Seidel, I. 2008. Back to Nature guide to
L-catfishes, Ettlingen, Germany 208 p.