Cynopoecilus melanotaenia (Regan, 1912)
photo by Loureiro, M.

Family:  Rivulidae (Rivulines), subfamily: Cynolebiinae
Max. size:  4.34 cm SL (male/unsexed); 3.53 cm SL (female)
Environment:  benthopelagic; freshwater, non-migratory
Distribution:  South America: Brazil and Uruguay.
Diagnosis:  Dorsal spines (total): 0-0; Dorsal soft rays (total): 16-19; Anal spines: 0-0; Anal soft rays: 22-25; Vertebrae: 28-30. Having faint spots restricted to the dorsal portion of the fin or caudal spots absent; pectoral fin length of male 18.6-22.6% SL; longitudinal rows of spots on body of male pale golden to greenish golden anteriorly and light blue posteriorly; pelvic fin length 6.8-8.3% SL in male, 6.4-7.5% in female; dark brown irregular marks on dorsum below dorsal fin of male, dorsal head profile of adult male slightly concave; lateral body stripes of male dark reddish brown; caudal fin or male without a bright blue zone along posterior margin of the fin; 11-14 supraorbital neuromasts and 1-3 neuromasts per scale of the lateral line (Ref. 42931).
Biology:  Bottom spawner, 2 months incubation. Is very difficult to maintain in aquarium (Ref. 27139).
IUCN Red List Status: Not Evaluated (N.E.) Ref. (130435)
Threat to humans:  harmless


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