''Cynolebias'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

of freshwater annual killifish in the

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

Rivulidae. They 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 elsew ...

to northeastern Brazil, generally in temporary waters such as ponds in the

Caatinga Caatinga (, ) is a type of semi-arid tropical vegetation, and an ecoregion characterized by this vegetation in interior northeastern Brazil. The name "Caatinga" is a Tupi word meaning "white forest" or "white vegetation" (''caa'' = forest, v ...

and adjacent regions. By far the highest species richness is in the

São Francisco River The São Francisco River (, ) is a large river in Brazil. With a length of , it is the longest river that runs entirely in Brazilian territory, and the fourth longest in South America and overall in Brazil (after the Amazon, the Paraná and t ...

basin, but there are also

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

east and north of this system, and west as far as the

Tocantins River The Tocantins River ( pt, Rio Tocantins, link=no , , Parkatêjê dialect, Parkatêjê: ''Pyti'' ɨˈti is a river in Brazil, the central fluvial artery of the country. In the Tupi language, its name means "toucan's beak" (''Tukã'' for "toucan ...

basin.Costa, W. J. E. M. (2014): Six new species of seasonal killifishes of the genus Cynolebias from the São Francisco river basin, Brazilian Caatinga, with notes on C. porosus (Cyprinodontiformes: Rivulidae). ''Ichthyological Exploration of Freshwaters, 25 (1): 79-96''. Many species have rather small distributions and some are highly

threatened Threatened species are any species (including animals, plants and fungi) which are vulnerable to endangerment in the near future. Species that are threatened are sometimes characterised by the population dynamics measure of ''critical depensat ...

. They are small thickset fish, 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

The currently recognized species in this genus are: * '' Cynolebias albipunctatus'' W. J. E. M. Costa & G. C. Brasil, 1991 * '' Cynolebias altus'' W. J. E. M. Costa, 2001 * ''

Cynolebias attenuatus ''Cynolebias'' is a genus of freshwater annual killifish in the family Rivulidae. They are endemic to northeastern Brazil, generally in temporary waters such as ponds in the Caatinga and adjacent regions. By far the highest species richness is i ...

'' W. J. E. M. Costa, 2001 * ''

Cynolebias gibbus ''Cynolebias'' is a genus of freshwater annual killifish in the family Rivulidae. They are endemic to northeastern Brazil, generally in temporary waters such as ponds in the Caatinga and adjacent regions. By far the highest species richness i ...

'' W. J. E. M. Costa, 2001 * ''

Cynolebias gilbertoi ''Cynolebias'' is a genus of freshwater annual killifish in the family Rivulidae. They are endemic to northeastern Brazil, generally in temporary waters such as ponds in the Caatinga and adjacent regions. By far the highest species richness i ...

'' W. J. E. M. Costa, 1998 * ''

Cynolebias griseus ''Cynolebias'' is a genus of freshwater annual killifish in the family Rivulidae. They are endemic to northeastern Brazil, generally in temporary waters such as ponds in the Caatinga and adjacent regions. By far the highest species richness i ...

'' W. J. E. M. Costa, Lacerda & G. C. Brasil, 1990 * ''

Cynolebias itapicuruensis ''Cynolebias'' is a genus of freshwater annual killifish in the family Rivulidae. They are endemic to northeastern Brazil, generally in temporary waters such as ponds in the Caatinga and adjacent regions. By far the highest species richness is i ...

'' W. J. E. M. Costa, 2001 * ''

Cynolebias leptocephalus ''Cynolebias'' is a genus of freshwater annual killifish in the family Rivulidae. They are endemic to northeastern Brazil, generally in temporary waters such as ponds in the Caatinga and adjacent regions. By far the highest species richness is i ...

'' W. J. E. M. Costa & G. C. Brasil, 1993 * ''

Cynolebias microphthalmus ''Cynolebias'' is a genus of freshwater annual killifish in the family Rivulidae. They are endemic to northeastern Brazil, generally in temporary waters such as ponds in the Caatinga and adjacent regions. By far the highest species richness is i ...

'' W. J. E. M. Costa & G. C. Brasil, 1995 * ''

Cynolebias obscurus ''Cynolebias'' is a genus of freshwater annual killifish in the family Rivulidae. They are endemic to northeastern Brazil, generally in temporary waters such as ponds in the Caatinga and adjacent regions. By far the highest species richness is i ...

'' W. J. E. M. Costa, 2014 * ''

Cynolebias ochraceus ''Cynolebias'' is a genus of freshwater annual killifish in the family Rivulidae. They are endemic to northeastern Brazil, generally in temporary waters such as ponds in the Caatinga and adjacent regions. By far the highest species richness is i ...

'' W. J. E. M. Costa, 2014 * ''

Cynolebias oticus ''Cynolebias'' is a genus of freshwater annual killifish in the family Rivulidae. They are endemic to northeastern Brazil, generally in temporary waters such as ponds in the Caatinga and adjacent regions. By far the highest species richness is i ...

'' W. J. E. M. Costa, 2014 * ''

Cynolebias paraguassuensis ''Cynolebias'' is a genus of freshwater annual killifish in the family Rivulidae. They are endemic to northeastern Brazil, generally in temporary waters such as ponds in the Caatinga and adjacent regions. By far the highest species richness is i ...

'' W. J. E. M. Costa, Suzart & D. T. B. Nielsen, 2007 * ''

Cynolebias parietalis ''Cynolebias'' is a genus of freshwater annual killifish in the family Rivulidae. They are endemic to northeastern Brazil, generally in temporary waters such as ponds in the Caatinga and adjacent regions. By far the highest species richness i ...

'' W. J. E. M. Costa, 2014 * '' Cynolebias parnaibensis'' W. J. E. M. Costa, T. P. A. Ramos,

Alexandre Alexandre may refer to: * Alexandre (given name) * Alexandre (surname) * Alexandre (film) See also * Alexander * Xano (disambiguation) Xano is the name of: * Xano, a Portuguese hypocoristic of the name "Alexandre (disambiguation) Alexandre may re ...

& R. T. C. Ramos, 2010 * '' Cynolebias perforatus'' W. J. E. M. Costa & G. C. Brasil, 1991 * '' Cynolebias porosus''

Steindachner Franz Steindachner (11 November 1834 in Vienna – 10 December 1919 in Vienna) was an Austrian zoologist, ichthyologist, and herpetologist. He published over 200 papers on fishes and over 50 papers on reptiles and amphibians. Steindachner describ ...

, 1876 * '' Cynolebias rectiventer'' W. J. E. M. Costa, 2014 * '' Cynolebias roseus'' W. J. E. M. Costa, 2014 * ''

Cynolebias vazabarrisensis ''Cynolebias'' is a genus of freshwater annual killifish in the family Rivulidae. They are endemic to northeastern Brazil, generally in temporary waters such as ponds in the Caatinga and adjacent regions. By far the highest species richness i ...

'' W. J. E. M. Costa, 2001

References

Rivulidae Freshwater fish genera Taxa named by Franz Steindachner Taxonomy articles created by Polbot {{Cyprinodontiformes-stub