''Trigonectes'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial n ...

fish Fish are aquatic, craniate, gill-bearing animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups. Approximately 95% ...

in the

family Family (from la, familia) is a group of people related either by consanguinity (by recognized birth) or affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its members and of society. Idea ...

Rivulidae The Rivulidae are a family of killifishes in the order Cyprinodontiformes. They are commonly known as rivulids, South American killifish or New World killifish. The latter names are slightly misleading, however, as they are neither restricted to ...

. These annual

killifish A killifish is any of various oviparous (egg-laying) cyprinodontiform fish (including families Aplocheilidae, Cyprinodontidae, Fundulidae, Profundulidae and Valenciidae). All together, there are 1,270 species of killifish, the biggest famil ...

are

endemic Endemism is the state of a species being found 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 found els ...

to the

Paraguay Paraguay (; ), officially the Republic of Paraguay ( es, República del Paraguay, links=no; gn, Tavakuairetã Paraguái, links=si), is a landlocked country in South America. It is bordered by Argentina to the south and southwest, Brazil to th ...

, upper

Madeira ) , anthem = ( en, "Anthem of the Autonomous Region of Madeira") , song_type = Regional anthem , image_map=EU-Portugal_with_Madeira_circled.svg , map_alt=Location of Madeira , map_caption=Location of Madeira , subdivision_type=Sovereign st ...

(

Beni is a Japanese R&B singer, who debuted in 2004 under the Avex Trax label. In 2008, Arashiro left Avex Trax and transferred to Universal Music Japan where she started to perform as simply Beni (stylized as BENI). She was initially best known fo ...

, 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 2 ...

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. These data are used in many areas of ichthyology, including taxonomy and fisheries biology. Overall length * Standard length (SL) is the length of a fish ...

depending on the exact species.

Species

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

Trigonectes aplocheiloides ''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 ...

Huber Huber is a German-language surname. It derives from the German word ''Hube'' 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, ...

, 1995 * ''

Trigonectes balzanii ''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 Para ...

'' (

Perugia Perugia (, , ; lat, Perusia) is the capital city of Umbria in central Italy, crossed by the River Tiber, and of the province of Perugia. The city is located about north of Rome and southeast of Florence. It covers a high hilltop and par ...

, 1891) * ''

Trigonectes macrophthalmus ''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 Para ...

'' W. J. E. M. Costa, 1990 * ''

Trigonectes rogoaguae ''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 Para ...

'' ( N. E. Pearson & G. S. Myers, 1924) * ''

Trigonectes rubromarginatus ''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 Para ...

'' W. J. E. M. Costa, 1990 * ''

Trigonectes strigabundus ''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 Para ...

'' G. S. Myers, 1925

References

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