Abstract
Jenynsia tucumana new species is described from the upper Río Salí basin, province of Tucumán, northwestern Argentina. The new species is diagnosed by the possession of a row of dark markings ranging from dots to small vertical stripes from the tip of adpressed pectoral fin to the posterior margin of the hypural. Also, the new species has a mandibular canal pore W and a symmetrical fifth anal-fin ray in adult males; whereas the females lack a urogenital swelling. According to a phylogenetic reanalysis of the genus, the new species is sister to most species of the subgenus Jenynsia, except for J. onca and possibly J. sanctaecatarinae.References
Aceñolaza, F. & Sprechmann P. (2002) The Miocene marine transgression in the meridional Atlantic of South America. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen, 225, 75–84.
Butí, C. & Miquelarena, A. (1995) Ictiofauna del Río Salí superior, departamento Trancas, Tucumán, República Argentina. Acta zoológica lilloana, 43, 21–44.
Farris, J.S. (1969) A successive approximations approach to character weighting. Systematic Zoology, 18, 374–385.
Farris, J.S. (1988) Hennig86, program and documentation. Published by the author, Port Jefferson, New York.
Ghedotti, M.J. (1998) Phylogeny and classification of the Anablepidae (Teleostei: Cyprinodontiformes). In: Malabarba L.R., Reis, R.E., Vari, R.P., Lucena, Z.M.S. & Lucena, C.A.S. (Eds.), Phylogeny and classification of neotropical fishes. Edipucrs, Porto Alegre, pp. 561–582.
Ghedotti, M.J., Downing–Meisner, A. & Lucinda, P.H.F. (2001) New species of Jenynsia (Teleostei: Cyprinodontiformes) from southern Brazil and its phylogenetic relationships. Copeia, 3, 726–736.
Ghedotti, M.J. & Weitzman, S.H. (1995) Descriptions of two new species of Jenynsia (Cyprinodontiformes: Anablepidae) from southern Brazil. Copeia, 4, 939–946.
Ghedotti, M.J. & Weitzman, S.H. (1996) A new species of Jenynsia (Cyprinodontiformes: Anablepidae) from Brazil with comments on the composition and taxonomy of the genus. Occasional Papers of the Natural History Museum of the University of Kansas, 179, 1–25.
Giribet, G. (2005) TNT – Tree analysis using new technology. Version 1.0. Systematic Biology, 54, 176–178.
Goloboff, P.A. (1993) Estimating character weigths during tree search. Cladistics, 9, 83–91.
Goloboff, P.A. (1997) Self-weighted optimization: Tree searches and character states reconstruction under implied transformation costs. Cladistics, 13, 225–245.
Goloboff, P.A. & Farris, J.S. (2001) Methods for quick consensus estimation. Cladistics, 17, S26–S34.
Goloboff, P.A., Farris, J.S. & Nixon, K.C. (2003a) T.N.T.: Tree Analysis using New Technology, version 1.0. Program and documentation available from the authors and at www.zmuc.dk/public/phylogeny.
Goloboff, P.A.; Farris, J.S., Källersjö, M. Oxelman, B., Ramírez, M.J., & Szumik, C.A. (2003b) Improvements to resampling measures of group support. Cladistics, 19, 324–332.
Gosline, W.R. (1949) The sensory canals of the head in some cyprinodont fishes. with particular reference to the genus Fundulus. Occasional Papers of the Museum of Zoology, University of Michigan, 519, 1–17.
Hovenkamp, P. (2004) Review of: TNT – Tree analysis using new technology – Version 1.0, by P. Goloboff, J. S. Farris and K. Nixon. Available from the authors and from http://www.zmuc.dk/public/phylogeny. Cladistics, 20, 378–383.
Lipscomb, D.L. (1992) Parsimony, homology and the analysis of multistate characters. Cladistics, 8, 45–65.
Lucinda, P.H.F., Reis, R.E. & Quevedo, R. (2002) Jenynsia onca, a new species of anablepid fish (Teleostei: Cyprinodontiformes) from southern Brazil and its phylogenetic position. Ichthyological Exploration of Freshwaters, 13, 33–40.
Meier, R. & Ali, F.B. (2005) Software review: The newest kid on the parsimony block: TNT (Tree analysis using new technology). Systematic Entomology, 30, 179–182.
Meyer A. & Lydeard, C. (1993) The evolution of copulatory organs, internal fertilization, placentas, and internal fertilization in Killifishes (Cyprinodontiformes), as inferred from a DNA phylogeny of the tyrosine kinase gene X-src. Proceedings of the Royal Society of London, Series B, 254, 153–162.
Parenti, L.R. (1981) A phylogenetic and biogeographic analysis of cyprinodontiform fishes (Teleostei: Aterinimorpha). Bulletin of the American Museum of Natural History, 168, 335–557.
Taylor, W.R. & Van Dyke, G.C. (1985) Revised procedures for stained and clearing small fishes and other vertebrates for bone and cartilage study. Cybium, 9, 107–119.