Abstract
A new species of Moenkhausia is described from the rio Amazonas and rio Orinoco basins. The new species can be distinguished from congeners mainly by the combination of a conspicuous, relatively small and circular humeral spot, a black spot on the upper caudal-fin lobe, lower caudal-fin lobe without spot or a faint one, and middle caudal-fin rays hyaline or with dark tips. Mature males have a unique combination of two large-sized bony hooks on the anal-fin rays and tiny spines on the distal portion of all fins, which distinguishes the new species from any other species of Characidae.References
Benine, R.C., Mariguela, T.C. & Oliveira, C. (2009) New species of Moenkhausia Eigenmann, 1903 (Characiformes: Characidae) with comments on the Moenkhausia oligoleps species complex. Neotropical Ichthyology, 7, 161–168.
Cabalzar, A., Lima, F.C.T. & Lopes, M.C. (2005) Peixes e gente no Alto Rio Tiquié: conhecimento Tukano e Tuyuka, ictiologia, etnologia. Instituto Socioambiental, São Paulo, 339 pp.
Costa, W.J.E.M. (1994) Description of two new species of the genus Moenkhausia (Characiformes: Characidae) from the central Brazil. Zoologischer Anzeiger, 232, 21–29.
Eigenmann, C.H. (1903) New genera of South American fresh-water fishes and new names for some old genera. Smithsonian Miscellaneous Collections, 45, 144–148.
Eigenmann, C.H. (1917) The American Characidae - I. Memoirs of the Museum of Comparative Zoology, 43, 1–102.
Fink, W.L. (1979) a new species of Moenkhausia from the Mato Grosso region of Brazil (Pisces: Characidae). Breviora, 450, 1–12.
Fink, W.L. & Weitzman, S.H. (1974) The so-called Cheirodontin fishes of Central America with description of two new species (Pisces, Characidae). Smithsonian Contributions to Zoology, 172, 1–46.
Géry, J. (1992) Description de deux nouvelles espèses proches de Moenkhausia lepidura (Kner) (Poissons, Characiformes, Tetragonopterinae), avec une revue du groupe. Revue Française d'Aquariologie and Herp¨¦tologie, 19, 69–78.
Lima, F.C.T., Malabarba, L.R., Buckup, P.A., Silva, J.F.P., Vari, R.P, Harold, A., Benine, R.C., Oyakawa, O., Pavanelli, C.S., Menezes, N.A., Lucena, C.A.S., Malabarba, M.C.S.L., Lucena, Z.M.S., Reis, R.E., Langeani, F., Casatti, L., Bertaco, V.A., Moreira, C. & Lucinda, P.H.F. (2003) Genera Incertae Sedis In Characidae. In : Reis, R.E., Kullander, S.O. & Ferraris-Jr, C.J. (Eds.), Check List of Freshwater Fishes of South and Central America. Edipucrs, Porto Alegre, pp. 106–169
Lima, F.C.T., Britski, H.A. & Machado, F.A. (2007) A new Moenkhausia (Characiformes: Characidae) from central Brazil, with comments on the area relationship between the upper rio Tapajós and upper rio Paraguay systems. Aqua, International Journal of Ichthyology, 13, 45–54.
Lucena, Z.M.S. & Lucena, C.A.S. (1999) Moenkhausia tergimacula, a new species from the upper rio Tocantis, Brazil (Osteichthyes: Characidae). Ichthyological Exploration of Freshwaters, 10, 231–236.
Menezes, N.A. & Weitzman, S.H. (1990) Two new species of Mimagoniates(Teleostei: Characidae: Glandulocaudinae), their phylogeny and biogeography and a key to the glandulocaudin fishes of Brazil and Paraguay. Proceedings of the Biological Society of Washington, 103, 380.
Taylor, W.R. & Van Dyke, G.C. (1985) Revised procedures for staining and clearing small fishes and other vertebrates for bone and cartilage. Cybium, 9, 107–119.