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Costa, W.J.E.M.; Rivulus uakti sp. n. and R. amanapira sp. n. (Teleostei: Cyprinodontiformes: Rivulidae): two new species from the upper Rio Negro, Brazilian Amazonia; Zootaxa 465: 1-12 (2004)
| Species: | Rivulus atratus |
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| Description: | Garman, 1895 | |
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| References: | Dr Lothar Seegers, Killifishes of the World: New World Killis, Aqualog Verlag pg 125 Costa, W.J.E.M.; Rivulus uakti sp. n. and R. amanapira sp. n. (Teleostei: Cyprinodontiformes: Rivulidae): two new species from the upper Rio Negro, Brazilian Amazonia; Zootaxa 465: 1-12 (2004) |
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| Abstract: | Member of the Rivulus atratus species group, that includes Rivulus amanapira, Rivulus atratus, Rivulus ornatus, Rivulus rectocaudatus, Rivulus romeri, Rivulus tecminae and Rivulus uakti. |
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| Type Locality: | Jenaro Herrera, Peru. |
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| Size: | 4 cm |
| Characteristics: | This species is unique, unlike other Rivulus. The original description permits unambiguous identification of it. It is very small with a total length of no more than 32mm. It has a proportionally very large, high head. The caudal peduncle is very elongated. The region from the head to the caudal peduncle is flecked black. There are 3 or 4 transverse bands blotched on the flanks. There is no apparent sexual dimorphism. This species strictly inhabits the surface of the water and is unable to stay submerged. |
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2004 © South American Annuals Study Group