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Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Cyprinodontiformes
Family: Aplocheilidae
Genus: Rivulus
Poey, 1860
Type species
Rivulus cylindraceus
Poey, 1860

Rivulus is a genus of freshwater fish in the Aplocheilidae family of Cyprinodontiformes. It was formerly considered to be the largest genus in its family; however, the genus's size is currently in dispute. Wilson J. E. Costa split this genus into several new genera (including Anablepsoides, Atlantirivulus, Cynodonichthys, and Laimosemion) in 2011 leaving only a few species left in Rivulus itself.[1] A year later, J.H. Huber released a second paper refuting the proposed split, placing the above genera back in Rivulus and again making the genus the largest in the family Aplocheilidae.[2] Members of Rivulus and its disputed sister taxa are sometimes kept as aquarium fish.


The species indisputably remaining in this genus are found in South America (R. formosensis and R. tomasi), Cuba and the Isle of Pines (R. berovidesi, R. cylindraceus and R. insulaepinorum), and Hispaniola (R. roloffi). If Anablepsoides, Atlantirivulus, Cynodonichthys, Laimosemion and Melanorivulus are reintegrated back into Rivulus, the genus has an enormous range from Central America to Northern Argentina.


The following 7 species are considered part of Rivulus:[3]


  1. ^ Costa W.J.E.M. (2011). "Phylogenetic position and taxonomic status of Anablepsoides, Atlantirivulus, Cynodonichthys, Laimosemion and Melanorivulus (Cyprinodontiformes: Rivulidae)". Ichthyological Exploration of Freshwaters. 22 (3): 233–249. 
  2. ^ Huber J.H., 2012. Reappraisal of the Phylogeny of Rivulus and its Allied Focused on External Characters.
  3. ^ Froese, Rainer, and Daniel Pauly, eds. (2015). Species of Rivulus in FishBase. August 2015 version.
  4. ^ Silva R.R. (2015). "Rivulus berovidesi, a new killifish species (Teleostei: Rivulidae) from western Cuba". Zootaxa. 3949 (2): 289–296. doi:10.11646/zootaxa.3949.2.9. 
  5. ^ Costa, W.J.E.M. (2008). "Rivulus formosensis, a new aplocheiloid killifish from the upper Corrente River drainage, upper Paraná River basin, central Brazil (Cyprinodontiformes: Rivulidae)". Ichthyological Exploration of Freshwaters. 19 (1): 85–90. 
  6. ^ https://nas.er.usgs.gov/queries/factsheet.aspx?SpeciesID=881
  7. ^ Vermeulen F.B.M.; Valdesalici S.; Garcia-Gil J.R. (2013). "Rivulus tomasi (Teleostei: Cyprinodontiformes: Rivulidae), a new killifish from Tobogán de la Selva, middle Orinoco river drainage in the Amazonas Territory, southwest Venezuela". Aqua, International Journal of Ichthyology. 19 (4): 187–192.