Kryptolebias gracilis n. sp. (Teleostei: Cyprinodontiformes: Rivulidae): a new killifish from the Saquarema Lagoon basin, southeastern Brazil
Wilson J. E. M. Costa
aqua, International Journal of Ichthyology, pp. 7-12, Volume 13, Issue 1 – 25 October 2007
Kryptolebias gracilis n. sp. from the Mato Grosso River drainage of the Saquarema Lagoon basin, southeastern Brazil, is described. It is similar to K. brasiliensis in morphometric characters and general colour pattern. Both species share at least four colour patterns unique among congeners, supporting a hypothesis of sister group relationship between them: horizontal rows of greenish blue spots and blue bars on the flank, a dark brown stripe on the isthmus, dark brown and white bars on the basal portion of the anal fin in males and horizontal rows of pale golden to pale blue spots on the flank in females. Kryptolebias gracilis differs from K. brasiliensis by having fewer anal-fin rays, fewer scales in the longitudinal series, fewer mandibular neuromasts, a shorter lower jaw and a dark grey spot on the dorsal portion of the pectoral-fin base. The new species also differs from all its congeners in having a small size, with a maximum recorded adult size of 27.6 mm SL.
COSTA, W. J. E. M. 1987. Feeding habits of a fish community in a tropical coastal stream, Rio Mato Grosso, Brazil. Studies on Neotropical Fauna and Environment 22: 145-153.
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. 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. 2004. Relationships and redescription of Fundulus brasiliensis (Cyprinodontiformes: Rivulidae), with description of a new genus and notes on the classification of the Aplocheiloidei. Ichthyological Exploration of Freshwaters 15: 105-120.
COSTA, W. J. E. M. 2006. Redescription of Kryptolebias ocellatus (Hensel) and K. caudomarginatus (Seegers) (Teleostei: Cyprinodontiformes: Rivulidae), two killi fishes from mangroves of south-eastern Brazil. aqua, Journal of Ichthyology and Aquatic Biology 11: 5-12.
HOEDEMAN, J. J. 1958. The frontal scalation pattern in some groups of toothcarps (Pisces, Cyprinodontiformes). Bulletin of Aquatic Biology 1: 23-28.
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.