''Trigonectes'' is a

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

fish A fish (: fish or fishes) is an aquatic animal, aquatic, Anamniotes, anamniotic, gill-bearing vertebrate animal with swimming fish fin, fins and craniate, a hard skull, but lacking limb (anatomy), limbs with digit (anatomy), digits. Fish can ...

in the

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

Rivulidae The Rivulidae are a family (biology), family of killifishes in the order (biology), order Cyprinodontiformes. They are commonly known as rivulids, South American killifish or New World killifish. The latter names are slightly misleading, however, ...

. These annual

killifish A killifish is any of various oviparous (egg-laying) cyprinodontiform fish, including families Aplocheilidae, Pantanodontidae, Cyprinodontidae, Fundulidae, Nothobranchiidae, Profundulidae, Aphaniidae and Valenciidae. All together, there ar ...

are

endemic Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...

to the

Paraguay Paraguay, officially the Republic of Paraguay, is a landlocked country in South America. It is bordered by Argentina to the Argentina–Paraguay border, south and southwest, Brazil to the Brazil–Paraguay border, east and northeast, and Boli ...

, upper

Madeira Madeira ( ; ), officially the Autonomous Region of Madeira (), is an autonomous Regions of Portugal, autonomous region of Portugal. It is an archipelago situated in the North Atlantic Ocean, in the region of Macaronesia, just under north of ...

( Beni, Guaporé and Mamoré) and

Tocantins Tocantins () is one of the 26 states of Brazil. It is the newest state, formed in 1988 and encompassing what had formerly been the northern two-fifths of the state of Goiás. Tocantins covers and had an estimated population of 1,496,880 in 2014 ...

basins in far northern Argentina, Bolivia, central Brazil and western Paraguay. 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. They are relatively large killifish that are up to in

total length Fish measurement is the measuring of individual fish and various parts of their anatomies, for data used in many areas of ichthyology, including taxonomy and fishery biology. Overall length Standard length (SL) is the length of a fish measured f ...

depending on the exact species.

Species

There are currently 6 species in this genus: * '' Trigonectes aplocheiloides''

Huber Huber is a German-language surname. It derives from the German word meaning hide, a unit of land a farmer might possess, granting them the status of a free tenant. It is in the top ten most common surnames in the German-speaking world, especial ...

, 1995 * '' Trigonectes balzanii'' (

Perugia Perugia ( , ; ; ) is the capital city of Umbria in central Italy, crossed by the River Tiber. The city is located about north of Rome and southeast of Florence. It covers a high hilltop and part of the valleys around the area. It has 162,467 ...

, 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 ''Trigonectes'' is a genus of fish in the family (biology), family Rivulidae. These annual killifish are Endemism, endemic to the Paraguay River, Paraguay, upper Madeira River, Madeira (Beni River, Beni, Guaporé River, Guaporé and Mamoré River ...

'' G. S. Myers, 1925

References

Rivulidae Freshwater fish genera Taxa named by George S. Myers {{Rivulidae-stub