| Family: |
Characidae (Characins; tetras), subfamily: Characinae |
| Max. size: |
1.54 cm SL (male/unsexed) |
| Environment: |
benthopelagic; freshwater; depth range 0 - 1 m |
| Distribution: |
South America: Rio Negro basin, Amazonas, Brazil. |
| Diagnosis: |
Dorsal soft rays (total): 10-11; Vertebrae: 32-34. Priocharax nanus can be distinguished from its congeners (P. ariel and P. pygmaeus) by having i,6 pelvic-fin rays (vs. i,5), a claustrum (vs. claustrum absent) and two postcleithra (vs. postcleithra absent). It can be further diagnosed from P. ariel by having 9-10 gill rakers on the lower limb of the first branchial arch (vs. 11-13), caudal peduncle length 13.5-16.8 % SL (vs. 18.1- 23.7 % SL); and 21-26 branched anal-fin rays (vs. 16-21) (Ref. 96862).
Description: dorsal-fin rays ii.8-9; anal-fin rays iv-v, 21-26; pelvic-fin rays i,6. Pectoral fin with
larval structure; and pectoral-fin rays absent (Ref. 96862). |
| Biology: |
Collected in the black acidic waters of the Rio Negro basin around the submerged vegetation at depths of about 1 m or less and from an area exposed to the sun in warm, shallow water, approximately 50 cm deep (Ref. 96862). |
| IUCN Red List Status: |
Least Concern (LC); Date assessed: 07 November 2018 Ref. (130435)
|
| Threat to humans: |
harmless |
| Country info: |
|
Source and more info: www.fishbase.org. For personal, classroom, and other internal use only. Not for publication.