Wilson J. E. M. Costa

aqua, International Journal of Ichthyology, pp. 123-128, Volume 12, Issue 3 – 10 July 2007

Abstract
Rivulus lazzarotoi n. sp., a member of the R. santensis species group from the Jurumirim River basin, southeastern Brazil, is described. It is hypothesized to be closely related to R. simplicis as both uniquely have numerous neuromasts in the infraorbital series. Rivulus lazzarotoi differs from R. simplicis in having its dorsal-fin origin posteriorly inserted and a longer pectoral fin in males. It is distinguished from all species of the R. santensis group in possessing minute pelvic fins, a unique colour pattern on the anal fin in males and a large and round caudal spot in females. Monophyly of the R. santensis species group is further supported by a derived arrangement of infraorbital neuromasts.

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REFERENCES

BERKENKAMP, H. O. 1984. Eine neue Bachlingsart aus dem Staat Sta. Catarina/Brasilien, Rivulus haraldsiolii spec. nov. (Pisces – Rivulidae). Amazoniana 8: 429-439.

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: 581-587.

COSTA,W. J. E.M. 1995. Pearl killifishes – the Cynolebiatinae: systematics and biogeography of the neotropical annual fish subfamily. Tropical Fish Hobbyist, Neptune City, 128 pp.

COSTA, W. J. E. M. 1998. Phylogeny and classification of Rivulidae revisited: origin and evolution of annualism and miniaturization in rivulid fishes. Journal of Comparative Biology 3: 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: 333-383.

COSTA, W. J. E. M. 2003. 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. 2004. Rivulus simplicis n. sp. (Cyprinodontiformes: Rivulidae): a new killifish from the coastal plains of south-eastern Brazil. aqua, Journal of Ichthyology and Aquatic Biology 8: 103-108.

COSTA, W. J. E. M. 2006. Relationships and taxonomy of the killifish genus Rivulus (Cyprinodontiformes: Aplocheiloidei: Rivulidae) from the Brazilian Amazonas river basin, with notes on historical ecology. aqua, Journal of Ichthyology and Aquatic Biology 11: 133-175.

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

HOEDEMAN, J. J. 1958. The frontal scalation pattern in some groups of toothcarps (Pisces, Cyprinodontiformes). Bulletin of Aquatic Biology 1: 23-28.

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

KÖHLER, W. 1906. Diesjährige Neuheiten in Wort und Bild, 3: Neu importierte Rivulus-Arten. Blätter für Aquarien- und Terrarienkunde 17: 404-408.

MURPHY, W. J., THOMERSON, J. E. & COLLIER, G. E. 1999. Phylogeny of the neotropical killifish family Rivulidae (Cyprinodontiformes, Aplocheiloidei) inferred from mitochondrial DNA sequences. Molecular and Phylogenetic Evolution 13: 289-301.

SEEGERS, L. 1984. Zur Revision der Rivulus-Arten Südost- Brasiliens, mit einer Neubeschreibung von Rivulus luelingi n. sp. und Rivulus caudomarginatus n. sp. (Pisces: Cyprinodontidae: Rivulinae). Zoologische Beiträge 28: 271-320.

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