Rivulus simplicis n. sp. (Cyprinodontiformes: Rivulidae): a new killifish from the coastal plains of south-eastern Brazil

Wilson J. E. M. Costa

aqua, International Journal of Ichthyology, pp. 103-108, Volume 8, Issue 3 – June 2004


Rivulus simplicis, is described from a small, isolated coastal plain area of south-eastern Brazil. It belongs to the R. santensis species group, which also includes R. depressus, R. haraldsiolii, R. janeiroensis, R. luelingi, R. nudiventris, and R. santensis, and is diagnosed among rivulids by uniquely possessing a curved ventral process of the angulo-articular bone. Rivulus simplicis differs from other species of the R. santensis group in having a distinct colour pattern of flank and caudal fin in males, and by a combination of morphological features, including high number of caudal fin rays and anterior position of the dorsal fin origin.

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Costa, W. J. E. M. 1991. Description of two new species of the genus Rivulus (Cyprinodontiformes: Rivulidae) from eastern South American coastal plains. Revue Suisse de Zoologie, 98 (3): 581-587.

Costa, W. J. E. M. 1995a. Revision of the Rivulus punctatus species-complex (Cyprinodontiformes: Rivulidae). Ichthyological Exploration of Freshwaters, 6 (3): 207-226.

Costa, W. J. E. M. 1995b. Pearl killifishes, the Cynolebiatinae: systematics and biogeography of a neotropical annual fish subfamily (Cyprinodontiformes: Rivulidae). TFH, Neptune City, NJ, USA, 128 pp.

Costa, W. J. E. M. 1998. Phylogeny and classification of Rivulidae revisited: evolution of annualism and miniaturization in rivulid fishes (Cyprinodontiformes: Aplocheiloidei). Journal of Comparative Biology, 3 (1): 33-92.

Costa, W. J. E. M. 2001. The neotropical annual fish genus Cynolebias (Cyprinodontiformes: Rivulidae): phylogenetic relationships, taxonomic revision and biogeography. Ichthyological Exploration of Freshwaters, 12 (4): 333-383.

Costa, W. J. E. M. 2003a. Family Rivulidae (South American annual fishes). In: Check list of the freshwater fishes of South and Central America (Eds. R. E. Reis, S. O. Kullander & C. J. Ferraris, Jr.) : 526-548. Edipucrs, Porto Alegre.

Costa, W. J. E. M. 2003b. Rivulus paracatuensis n. sp. (Cyprinodontiformes: Rivulidae): a new rivuline species from the Rio São Francisco basin, Brazil. aqua, Journal of Ichthyology and Aquatic Biology, 7 (1): 39-43.

Costa, W. J. E. M. 2003c. A new miniature rivuline fish from the upper Negro river basin, northern Brazil (Teleostei, Cyprinodontiformes, Rivulidae). Arquivos do Museu Nacional, Rio de Janeiro, 61 (3): 175-178.

Costa, W. J. E. M. (in press). Relationships and redescription of Fundulus brasiliensis Valenciennes (Cyprinodontiformes: Rivulidae), with description ofa new genus and notes on the classification of the Aplocheiloidei. Ichthyological Exploration of Freshwaters.

Costa, W. J. E. M. & G. C. Brasil. 1991. Description of a new species of Rivulus (Cyprinodontiformes: Rivulidae) from the coastal plains of eastern Brazil. Ichthyological Exploration of Freshwaters, 1 (4): 379-383.

Hoedeman, J. J. 1958. Rivulid fishes of the Antilles. Studies on the Fauna of Curação and other Caribbean Islands, 32 (3): 112-127.

Hrbek, T. & A. Larson. 1999. The evolution of diapause in the killifish family Rivulidae (Atherinomorpha, Cyprinodontiformes): a molecular phylogenetic and biogeographic perspective. Evolution, 53 (4): 1200-1216.

Taylor, W. R. & G. C. Van Dyke. 1985. Revised procedures for staining and clearing small fishes and other vertebrates for bone and cartilage study. Cybium, 9 (2): 107-109.

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