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: Myers.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Freshwater; benthopelagic; non-migratory. Tropical
South America: Tocantins River basin, Brazil.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 12.0 cm TL male/unsexed; (Ref. 36579)
Short description
Identification keys | Morphology | Morphometrics
Dorsal soft rays (total): 10 - 12; Anal soft rays: 16 - 17. Diagnosed by having straight mouth cleft; smaller pelvic fin of the male (tip reaching to the base of the 5th anal ray); and the presence of a pale pink stripe along the ventral margin of the male caudal fin (Ref. 26656).
Bottom spawner, 2 months incubation. Is easy to maintain in the aquarium (Ref. 27139).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Costa, W.J.E.M., 1990. Systematics and distribution of the neotropical annual fish genus Trigonectes (Cyprinodontiformes, Rivulidae), with description of two new species. Ichthyol. Explor. Freshwat. 1(2):135-150. (Ref. 26656)
IUCN Red List Status (Ref. 130435: Version 2025-2)
Threat to humans
Harmless
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