Abstract
We describe a new species, Hyphessobrycon sebastiani, from the San Juan River drainage of the Pacific versant of Colombia. This new species of Hyphessobrycon is distinguished from all congeners that share two humeral spots and no caudal blotch by having: five unbranched and 25 to 28 branched anal–fin rays; 12–13 branched pectoral–fin rays; 35–37 scales in the longitudinal series; eight scales between the lateral line and the dorsal–fin origin; 12–13 predorsal scales; 13–18 pored lateral–line scales and three pairs of large bony hooks on anal fin of mature males.References
Böhlke, J.E. (1955) Studies on fishes of the family Characidae, No, 8. The description of a new Hemigrammus from the Rio Negro Brazil. Transactions of the Kansas Academy of Science, 58(1), 229–236.
Capitoli, R. (1992) Método para estimar volumes do conteúdo alimentar de peixes e macroinvertebrados. Atlântica, 4, 17–120.
Eigenmann, C.H., (1913) Some results from an ichthyological reconnaissance of Colombia, South America, Part II. Indiana University Studies, 18, 1–32.
Eigenmann, C.H. (1918). The American Characidae. Part 2. Memoirs of Museum of Comparative Zoology, 43, 103–208.
Fink, W.L. & Weitzman, S.H. (1974) The so–called Cheirodontin fishes of Central America with descriptions of two new species (Pisces: Characidae). Smithsonian Contr. Zool. 172, 1–45.
García-Alzate, C.A. (2009) Análisis filogenético y biogeográfico de las especies de Hyphessobrycon (Characiformes: Characidae) grupo heterorhabdus. Ph. D. Thesis, Facultad de Ciencias–Instituto de Zoología y Ecología Tropical, Universidad Central de Venezuela. Caracas. 187 pp.
García-Alzate, C., Román-Valencia, C. & Taphorn, D. (2008a) Hyphessobrycon oritoensis (Characiformes: Characidae), a new species from the Putumayo River drainage, Colombian Amazon. Zootaxa, 1813, 42–50.
García-Alzate, C., Román-Valencia, C & Taphorn, D. (2008b). Taxonomic revision of the Hyphessobrycon heterorhabdus species group (Teleostei: Characidae) from Venezuela, with description of two new species. Vertebrate Zoology, 58, 139–157.
Géry, J. (1977) Characoids of the World. TFH Publication Neptune City, NJ, 672 p.
Hammer, Ø., Harper, D.A.T. & Ryan, P.D. 2008. PAST – PAlaeontological STatistics, ver. 1.81., 1–88.
Hynes, H.B.N. (1950) The food of fresh–water Sticklebacks (Gasterosteus aculeatus and Pygosteus pungitius) with a review of methods used in studies of the food of fishes. Journal Animal Ecology, 19, 36–58.
Hyslop, E.J. (1980) Stomach contents analysis–a review and methods and their application. Journal of Fish Biology, 17, 411–429.
Lima, F.C.T & Gerhard, P. (2001) A new Hyphessobrycon (Characiformes: Characidae) from Chapada Diamantina, Bahia, Brazil, with notes on its natural history. Ichthyological Exploration of Freshwaters, 12(2), 105–114.
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, 107–119.
Vari, R. P. (1995) The neotropical fish family Ctenoluciidae (Teleostei: Ostariophysi: Characiformes) supra and intrafamilial phylogenetic relationships, with a revisionary study. Smithsonian Contribution to Zoology, 564, 1–96.
Weitzman, S.H. (1962) The osteology of Brycon meeki, a generalized characid fish, with an osteological definition of the family. Stanford Ichthyological Bulletin, 8(1), 3–77.
Weitzman, S.H. (1977) A new species of characoid fish, Hyphessobrycon diancistrus, from the Río Vichada, Orinoco river drainage, Colombia, South America (Teleostei: Characidae). Proceedings of the Biological Society of Washington, 90(2), 348–357.
Weitzman, S.H. & Fink, W.L. (1983) Relationships of the neon tetras, a group of South American freshwater fishes (Teleostei, Characidae), with comments on the phylogeny of new world. Bulletin of Museum of Comparative Zoology, 150(6), 339–395.