The Rio Tapajós, and Rio Tracuá where
P. zawadzkii occurs are clear water rivers,
varying from medium to large size, with rocky outcrops
forming small waterfalls and substrates of rocks and
sand. Description: Dorsal spines
(total): 2; Dorsal soft rays (total): 7; Anal spines:
1; Anal soft rays: 5. Pseudancistrus zawadzkii
can be distinguished from all known congeners, except
members of the P. barbatus group, by the
possession of hypertrophied odontodes along the snout
margin and the absence of evertible cheek plates.
It further differs from other congeners by the combination
of the following characters: whitish spots that abruptly
increase in size between the head (diameter 1.1-1.3
mm) and body (diameter 2.6-3.0 mm); odontodes along
margin of snout increasing gradually in length from
posterior of snout tip to cheek; longest odontodes
on posterior most portion of non-evertible cheek plates.;
rounded spots that do not cover more than one plate
along the body; head depth 67.0-72.7% of HL; cleithral
width 35.2-38.0% of SL; distance between posteromedial
margin of supraoccipital and dorsal-fin origin 6.7-9.2%
of SL; anal-fin spine length 11.9-13.8% of SL; peduncle
depth 12.5-14.2% of SL; and internares distance 12.7-16.6%
of HL. Aquarium Care: The Pseudancistrus
genera are not the easiest to maintain in the aquarium
as they will need pristine water conditions with well
filtered water which should not be too hard. Warm
water should be the norm. Adult males are very territorial
and will not get on with other large Loricariid catfish.
Sexual Differences: Males have a
broad head and posses long bristles along the edge
of the snout. Diet: Aufwuch grazer,
mainly vegetarian, with lettuce, spinach, cucumber
and courgette (zucchini), vegetarian flake and tablets.
Will eat other foods also such as insect larvae, zooplankton
and soft wood but will need to be kept on a mainly
Rio Tapajós and rio Tracuá of the rio
Tapajós basin in Brazil.
Da Costa E Silva, G.
de S., F.F. Roxo, R. Britzke and C. Oliveira,
2014. New species of the Pseudacistrus barbatus group
(Siluriformes, Loricariidae) with comments on its
biogeography and dispersal routes. ZooKeys 406:1-23. Froese, R. and D. Pauly. Editors.
2015. FishBase. World Wide Web electronic publication.
www.fishbase.org, ( 08/2015 ). Seidel, I.
2008. Back to Nature guide to L-catfishes, Ettlingen,
Germany 208 p.