Teleostei (teleosts) >
Cyprinodontiformes (Rivulines, killifishes and live bearers) >
Rivulidae (Rivulines) > Rivulinae
Etymology: Trigonectes: Greek, trygon = a sting ray + Greek, nekton = swimmer (Ref. 45335).
More on authors: Pearson & Myers.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Freshwater; benthopelagic; non-migratory. Tropical
South America: Mamoré River basin, Bolivia.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 10.0 cm TL male/unsexed; (Ref. 36579)
Short description
Identification keys | Morphology | Morphometrics
Dorsal soft rays (total): 9 - 10; Anal soft rays: 14 - 17. Diagnosed by having curved mouth cleft; small head length (27.6-28.6% SL in juvenile; adults of all Trigonectes species have smaller heads than juveniles; so far T. rogoaguae adults were not available) (Ref. 26656).
Bottom spawner, 6 months incubation (Ref. 27139).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Costa, W.J.E.M., 2003. Rivulidae (South American Annual Fishes). p. 526-548. In R.E. Reis, S.O. Kullander and C.J. Ferraris, Jr. (eds.) Checklist of the Freshwater Fishes of South and Central America. Porto Alegre: EDIPUCRS, Brasil. (Ref. 36579)
IUCN Red List Status (Ref. 130435: Version 2025-2)
Threat to humans
Harmless
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