Cnesterodon Holopteros (Cyprinodontiformes: Poeciliidae: Poeciliinae), a New Species from the Republic of Uruguay

Cnesterodon Holopteros (Cyprinodontiformes: Poeciliidae: Poeciliinae), a New Species from the Republic of Uruguay

Zootaxa 1350: 21–31 (2006) ISSN 1175-5326 (print edition) www.mapress.com/zootaxa/ ZOOTAXA 1350 Copyright © 2006 Magnolia Press ISSN 1175-5334 (online edition) Cnesterodon holopteros (Cyprinodontiformes: Poeciliidae: Poeciliinae), a new species from the Republic of Uruguay PAULO H. F. LUCINDA1, THOMAS LITZ2 & ROBERTO RECUERO3 1Laboratório de Ictiologia Sistemática, Universidade Federal do Tocantins, Campus de Porto Nacional, Rua 3, Quadra 17, s/n, Jardim dos Ipês, Caixa Postal 136, 77.500-000 Porto Nacional, TO, Brazil. 2Krumpfhalde 47, 88448 Attenweiler, Germany. 3Senen Rodríguez 773, Las Piedras 23000, Canelones, Uruguay. Abstract Cnesterodon holopteros new species is described from the río Uruguai drainage. The new species is distinguished from its congeners by: (1) a series of small dark brown dots along predorsal portion of first, second or third lateral scale row, associated with vertical bars along body sides; (2) eight or nine (rarely seven) dark brown vertical bars (from one to three scales in depth) along lateral surface of body in females, which may extend nearly down to belly (i.e., at level of ventral profile); (3) bony style at male gonopodium tip long and gently arched, narrowing towards tip to form a distal filament and bearing a V-shaped membrane restricted to its proximal third; (4) four branchiostegal rays in females; and (5) unbranched pelvic-fin rays. Key words: Neotropical Ichthyofauna, taxonomy, phylogeny, live-bearing killifishes Resumen Cnesterodon holopteros nueva especie es descripta de la cuenca del río Uruguay. La nueva especie se distingue de sus congéneres por: (1) una serie de pequeñas manchas pardas oscuras a lo largo de la porción predorsal de la primera, segunda o tercera linea de escamas relacionadas con barras verticales a los costados del cuerpo; (2) ocho o nueve (raramente siete) barras verticales pardas oscuras en los flancos de las hembras (ocupando una a tres hileras de escamas), que pueden alcanzar casi hasta el vientre (p.ej. en el nivel del perfil ventral); (3) proceso óseo en el extremo del gonopodio masculino largo, suavemente arqueado, angostándose hacia el extremo para formar un filamento distal, con una membrana en forma de V, restringida a su tercio proximal; (4) 4 radios branquiostegos en hembras; (5) radios pélvicos no ramificados. Accepted by C. Gilbert: 20 Sept. 2006; published: 2 Nov. 2006 21.

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