| Family: |
Loricariidae (Armored catfishes), subfamily: Hypostominae |
| Max. size: |
11.64 cm SL (male/unsexed); 12.87 cm SL (female) |
| Environment: |
demersal; freshwater |
| Distribution: |
South America: Rio Tapajós and rio Tracuá of the rio Tapajós basin in Brazil. |
| Diagnosis: |
Dorsal spines (total): 2-2; Dorsal soft rays (total): 7-7; Anal spines: 1-1; Anal soft rays: 5-5. 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 (Ref. 95679). |
| Biology: |
Inhabits clear water rivers, varying from medium to large size, with rocky outcrops forming
small waterfalls and substrates of rocks and sand (Ref. 95679). |
| IUCN Red List Status: |
Not Evaluated (N.E.) Ref. (130435)
|
| Threat to humans: |
harmless |
| Country info: |
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