Trigonectes

Trigonectes is a genus of fish in the family Rivulidae. These annual killifish are endemic to the Paraguay, upper Madeira (Beni, Guaporé and Mamoré) and Tocantins basins in far northern Argentina, Bolivia, central Brazil and western Paraguay.^[2][3] They inhabit seasonal swamp, pools and similar habitats in open regions (for example, savanna). Once the water disappears, the adults die, but the eggs that have been laid in the bottom remain, only hatching after several months (up to a year) when the water returns.^[2][4]

Trigonectes
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Cyprinodontiformes
Family:	Rivulidae
Genus:	Trigonectes G. S. Myers, 1925
Type species
Trigonectes strigabundus Myers 1925[1]

They are relatively large killifish that are up to 8–16 cm (3.1–6.3 in) in total length depending on the exact species.^[5]

Species

There are currently 6 species in this genus:^[5]

• Trigonectes aplocheiloides Huber, 1995
• Trigonectes balzanii (Perugia, 1891)
• Trigonectes macrophthalmus W. J. E. M. Costa, 1990
• Trigonectes rogoaguae (N. E. Pearson & G. S. Myers, 1924)
• Trigonectes rubromarginatus W. J. E. M. Costa, 1990
• Trigonectes strigabundus G. S. Myers, 1925