''Cynopoecilus'' is a genus of killifish in the family Rivulidae. They are endemic to seasonal temporary pools in

Southern Brazil The South Region of Brazil (; ) is one of the five regions of Brazil. It includes the states of Paraná, Rio Grande do Sul, and Santa Catarina, and covers , being the smallest region of the country, occupying only about 6.76% of the territory ...

and northeastern Uruguay. Most species are restricted to the region bordering the

Patos Patos is a municipality of the state of Paraíba in the Northeast Region of Brazil. It is classified by the Brazilian Institute of Geography and Statistics as a sub-regional center A. It is located in the Espinharas River valley, surrounded by ...

– Mirim lagoons, but ''C. feltrini'' is found at the

Tubarão River The Tubarão River is a river in the Brazilian state of Santa Catarina. Geographical aspects It originates from the confluence of the Rocinha river and Bonito river in the municipality of Lauro Müller. The Tubarão River flows from the Serra ...

(north of the lagoons) and ''C. intimus'' is found at the middle

Gravataí River Gravataí River () is a river that runs along Gravataí (a city located in the metropolitan area of Porto Alegre Porto Alegre (, , Brazilian ; ) is the capital and largest city of the Brazilian state of Rio Grande do Sul. Its population of 1, ...

(inland from the lagoons).Costa, W.J.E.M., Amorim, P.F. & Mattos, J.L.O. (2016): A new species of inseminating seasonal killifish of the ''Cynopoecilus melanotaenia'' complex from southern Brazil (Cyprinodontiformes: Rivulidae). ''Biodiversity Data Journal, 4: e6888.'' The ''Cynopoecilus'' species have small ranges and are often threatened. The region inhabited by ''C. intimus'' has experienced extensive habitat destruction and recent surveys have not been able to locate this species; it may already be

extinct Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...

. They are small fish, up to in

standard 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 m ...

. Uniquely among killifish, ''Cynopoecilus'' and the closely related '' Campellolebias'' have internal fertilization.

Species

There are currently 6 recognized species in this genus: * '' Cynopoecilus feltrini'' W. J. E. M. Costa, Amorim & Mattos, 2016 * '' Cynopoecilus fulgens'' W. J. E. M. Costa, 2002 * '' Cynopoecilus intimus'' W. J. E. M. Costa, 2002 * '' Cynopoecilus melanotaenia'' (

Regan The family name Regan, along with its cognates O'Regan, O Regan, Reagan, and O'Reagan, is an Anglicized form of the Irish surname Ó Riagáin or Ó Ríogáin, from Ua Riagáin. The meaning is likely to have originated in ancient Gaelic ''ri'' ...

, 1912) * '' Cynopoecilus nigrovittatus'' W. J. E. M. Costa, 2002 * '' Cynopoecilus notabilis'' Ferrer, Wingert & L. R. Malabarba, 2014Ferrer, J., Wingert, J.M. & Malabarba, L.R. (2014): Description of a new species and phylogenetic analysis of the subtribe Cynopoecilina, including continuous characters without discretization (Cyprinodontiformes: Rivulidae). ''Zoological Journal of the Linnean Society, 172 (4): 846–866.''

References

{{Taxonbar, from=Q3753609 Rivulidae Freshwater fish genera Taxa named by Charles Tate Regan