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 author: Costa.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Freshwater; benthopelagic; non-migratory. Tropical
South America: Guaporé River basin.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 8.0 cm TL male/unsexed; (Ref. 36579)
Short description
Identification keys | Morphology | Morphometrics
Dorsal soft rays (total): 10 - 12; Anal soft rays: 16 - 17. Having curved mouth cleft; large eyes with orbital diameter 10.4-11.5% SL in adult males; body depth 22.1-22.2% SL in adult males; head length 30.6-32.7% SL in juveniles; and pelvic length 56.4-59.1% SL (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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