''Atlantirivulus'' 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 ...

of fishes 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, ...

. They 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 shallow swamps, creeks, streams and pools in the Atlantic Forest in southeastern

Brazil Brazil, officially the Federative Republic of Brazil, is the largest country in South America. It is the world's List of countries and dependencies by area, fifth-largest country by area and the List of countries and dependencies by population ...

, ranging from

Rio de Janeiro Rio de Janeiro, or simply Rio, is the capital of the Rio de Janeiro (state), state of Rio de Janeiro. It is the List of cities in Brazil by population, second-most-populous city in Brazil (after São Paulo) and the Largest cities in the America ...

to Santa Catarina. Several of the species are highly threatened, while others survive in well-protected reserves. ''A. janeiroensis'' was initially feared extinct, but has since been rediscovered in two reserves. Similar to closely related genera such as ''

Anablepsoides ''Anablepsoides'' is a genus of killifish in the family (biology), family Rivulidae native to tropical South America and the Lesser Antilles. The majority are from the Amazon basin, Amazon and Orinoco basins, as well as freshwater systems in the ...

'', ''

Cynodonichthys ''Cynodonichthys'' is a genus of freshwater killifish in the family Rivulidae. They are found in Middle America, ranging from southern Mexico (north to Oaxaca and the Yucatán Peninsula), through Central America (where most species live), to C ...

'', ''

Laimosemion ''Laimosemion'' is a genus of fish in the family Rivulidae from the Amazon basin and basins in the Guiana Shield in tropical South America. They mostly inhabit small streams, creeks, swamps and pools in lowlands, but locally occur to an altitude ...

'' and ''

Melanorivulus ''Melanorivulus'' is a genus of South American freshwater fish in the family Rivulidae. Most species are endemic to the Río de la Plata, eastern Amazon (west to Tapajós basin), Tocantins– Araguaia and São Francisco basins in Brazil, but a ...

'', ''Atlantirivulus'' are non-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 ...

. They are small fish, no more than 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 ...

. Compared to many species in the family, the colors of ''Atlantirivulus'' are relatively dull.

Species

Until 2011, ''Atlantirivulus'' were included in ''

Rivulus ''Rivulus'' is a genus of small freshwater fish in the Cyprinodontiformes family Rivulidae. It was traditionally considered to be the largest genus in its family; however, the genus's size is currently in dispute. Wilson J. E. Costa split this g ...

Atlantirivulus ribeirensis ''Atlantirivulus'' is a genus of fishes in the family (biology), family Rivulidae. They are Endemism, endemic to shallow swamps, creeks, streams and pools in the Atlantic Forest in southeastern Brazil, ranging from Rio de Janeiro (state), Rio de ...

'' W. J. E. M. Costa, 2014 * '' Atlantirivulus riograndensis'' W. J. E. M. Costa & Lanés, 2009 * '' Atlantirivulus santensis''

Köhler Köhler is a German language, German occupational surname literally meaning "charcoal burner" People *Achim Köhler (born 1964), German politician *Alban Köhler (1874–1947), German radiologist. Born in Petsa (Thuringia), he discovered a rare ...

, 1906 * '' Atlantirivulus simplicis'' W. J. E. M. Costa, 2004 * '' Atlantirivulus unaensis'' W. J. E. M. Costa &

De Luca DeLuca, also spelled Deluca or De Luca, is an Italian-language surname. People with the surname include: People * Adrian Deluca (born 1982), former Australian rules footballer * Alby De Luca (1908–1978), Australian rules footballer * Anthon ...

, 2009

References

Rivulidae Freshwater fish genera {{Rivulidae-stub