| Family: |
Characidae (Characins; tetras), subfamily: Stevardiinae |
| Max. size: |
5.87 cm SL (male/unsexed) |
| Environment: |
benthopelagic; freshwater |
| Distribution: |
South America: tributaries of the río Paraná basin in Argentina. |
| Diagnosis: |
Vertebrae: 37-37. Distinguished by the following combination of characters: anal fin with 22-24 (mode=24) branched rays; body depth at dorsal-fin origin 34.5-40.8 % SL (mean=37.9 % SL); nearly straight distal border of anal fin in matures males; and lateral line interrupted or with alternated series of perforated and non perforated scales. Other characters useful to diagnose this species include the following: 7-14 sheath scales on anal-fin base; anal-fin base length 2.9-3.4 in SL; interorbital width 2.7-2.9 in HL; 34-38 scales on longitudinal series; horizontal eye diameter 35.9-42.1% SL; snout length 24.0-27.3 % HL; upper jaw length 42.0-46.9% HL; maxillary teeth 3-6; pelvic-fin length 14.5-18.1% SL; snout to pelvic-fin origin 44.4-50.6% SL; snout to anal-fin origin 59.4-65.3% SL; snout to pelvic-fin origin 44.4-50.6% SL (Ref. 91033).
Description: Anal-fin rays iv-v,22-24; lateral line never complete, with anterior series of 8 to 12 pored scales (mode=11), followed by a median non-perforated scales series, and a posterior perforated series of 1 to 3 scales; Tttal number of scales in longitudinal series 34-38 (mode=36) (Ref. 91033). |
| Biology: |
The localities where the species were found had a turbid and rapidly flowing water
after heavy rain. The bottom is composed of mud, sand and stones (Ref. 91033). |
| IUCN Red List Status: |
Not Evaluated (N.E.) Ref. (130435)
|
| Threat to humans: |
harmless |
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