Wilson J. E. M. Costa, 2004, Rivulus uatuman sp. n. (Teleostei: Cyprinodontiformes: Rivulidae): a new miniature killifish from the central Brazilian Amazon., Zootaxa 696, pp. 1-8: 1

publication ID


publication LSID


persistent identifier


treatment provided by


scientific name



[[ Genus Rivulus   ZBK   ]]

The Neotropical killifish genus Rivulus Poey   ZBK   is a speciose assemblage with about 100 valid species occurring in most river basins of Middle and South America (Costa, 2003a, 2004a). The greatest diversity of the genus is concentrated in the area comprising river basins draining the Guiana Shield in northern South America, from where numerous species have been described in recent years (e.g., Costa, 2003b, 2004b, c; Huber, 1991, 1992; Lasso et al, 1992; Thomerson et al., 1991a, 1991b, 1992; Vermeulen & Isbrücker, 2000). Among them, two species of Rivulus   ZBK   endemic to the Rio Negro basin, Brazilian Amazon, R. romeri Costa   ZBK   and R. kirovskyi Costa   ZBK   , are unique among congeners in having a unique arrangement of supraorbital neuromasts and being the smallest species, reaching about 23 mm SL as adult maximum size (Costa, 2003b, 2004c). A third species of this group, collected in the Rio Uatumã basin, is herein described.