Atlantirivulus
Atlantirivulus is a genus of fishes in the family Rivulidae. They are endemic to shallow swamps, creeks, streams and pools in the Atlantic Forest in southeastern Brazil, ranging from Rio [de Janeiro (state)|Rio de Janeiro] 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, Cynodonichthys, Laimosemion and Melanorivulus, Atlantirivulus are non-annual killifish.
They are small fish, no more than in total length. Compared to many species in the family, the colors of Atlantirivulus are relatively dull.
Species
Until 2011, Atlantirivulus were included in Rivulus, and some prefer to maintain them in that genus.If recognized as a valid genus, there are currently 16 species in Atlantirivulus:Atlantirivulus depressus Wilson [José Eduardo Moreira da Costa|W. J. E. M. Costa], 1991Atlantirivulus enigmaticus Volcan, Suárez, Severo-Neto, Amorim & Wilson José [Eduardo Moreira da Costa|Costa], 2024Atlantirivulus guanabarensis W. J. E. M. Costa, 2014Atlantirivulus haraldsiolii Berkenkamp, 1984Atlantirivulus janeiroensis W. J. E. M. Costa, 1991Atlantirivulus jurubatibensis W. J. E. M. Costa, 2008Atlantirivulus lazzarotoi W. J. E. M. Costa, 2007Atlantirivulus luelingi Seegers, 1984Atlantirivulus maricensis W. J. E. M. Costa, 2014Atlantirivulus nudiventris W. J. E. M. Costa & G. C. Brasil, 1991Atlantirivulus paranaguensis W. J. E. M. Costa, 2014Atlantirivulus ribeirensis W. J. E. M. Costa, 2014Atlantirivulus riograndensis W. J. E. M. Costa & Luis [Esteban Krause Lanés|Lanés], 2009Atlantirivulus santensis Köhler, 1906Atlantirivulus simplicis W. J. E. M. Costa, 2004Atlantirivulus unaensis W. J. E. M. Costa & Andre Cordeiro [De Luca|De Luca], 2009