RESUMO
Five new fish species of the genus Hemibrycon are described from the Río Magdalena basin, Colombia, using morphometric, meristic and osteological characters. Hemibrycon paez (n=40) differs in number of lateral line scales (39 to 42 vs. 43 to 54), by the number of scales between lateral line and anal-fin origin (6 to 7 vs. 4 to 5) and between lateral line and dorsal-fin origin (6 to 7 vs. 8); H. quindos (n=66) distinguished from its congeners by one autopomorphy: Males with cartilaginous protuberance, rounded on the anal fin ray branched, along all rays (vs. cartilaginous protuberance not present on anal-fin rays in males), by the maxilla without a fold on its anterior end (vs. maxilla with folding only at posterior end), by the number of pored scales in the lateral line (35 to 40 vs. 40 to 46); H. raqueliae (n=117) distinguished by a widened first tooth on the maxilla with the remaining teeth decreasing sharply in size (vs. first tooth of maxilla slender, remaining teeth gradually diminishing), by the first maxilla tooth pentacuspid and wider than the others (vs. first tooth on maxilla unicuspid or tricuspid and of same size as the others); H. virolinica (n=34) distinguished by the posterior end of the extrascapular spine surpassing the postemporal (vs. posterior end of extrascapular not exceeding postemporal spine), by having the posterior end of the first proximal pteryigiophores of dorsal fin of the same size as the anterior edge (vs. the posterior end of the first proximal pteryigiophores of dorsal fin more elongated than the anterior edge); and H. yacopiae (n=78) is distinguished by the following autopomorphic characters: first laterosensorial infraorbitals canal in contact with the posterior end of antorbital (vs. laterosensorial canal not reaching posterior end of antorbital), by the tip of the supraoccipital spine widened (vs. supraoccipital spine acute), by the posterior end of ectopterygoids failing to come in contact with the quadrate bone (vs. in contact); by the posterior edge of palatine more widened than the anterior edge of ectopterygoids (vs. posterior edge of the palatine approximately the same size, except for H. paez).
Assuntos
Peixes/anatomia & histologia , Peixes/classificação , Animais , Colômbia , Masculino , RiosRESUMO
Five new fish species of the genus Hemibrycon are described from the Río Magdalena basin, Colombia, using morphometric, meristic and osteological characters. Hemibrycon paez (n=40) differs in number of lateral line scales (39 to 42 vs. 43 to 54), by the number of scales between lateral line and anal-fin origin (6 to 7 vs. 4 to 5) and between lateral line and dorsal-fin origin (6 to 7 vs. 8); H. quindos (n=66) distinguished from its congeners by one autopomorphy: Males with cartilaginous protuberance, rounded on the anal fin ray branched, along all rays (vs. cartilaginous protuberance not present on anal-fin rays in males), by the maxilla without a fold on its anterior end (vs. maxilla with folding only at posterior end), by the number of pored scales in the lateral line (35 to 40 vs. 40 to 46); H. raqueliae (n=117) distinguished by a widened first tooth on the maxilla with the remaining teeth decreasing sharply in size (vs. first tooth of maxilla slender, remaining teeth gradually diminishing), by the first maxilla tooth pentacuspid and wider than the others (vs. first tooth on maxilla unicuspid or tricuspid and of same size as the others); H. virolinica (n=34) distinguished by the posterior end of the extrascapular spine surpassing the postemporal (vs. posterior end of extrascapular not exceeding postemporal spine), by having the posterior end of the first proximal pteryigiophores of dorsal fin of the same size as the anterior edge (vs. the posterior end of the first proximal pteryigiophores of dorsal fin more elongated than the anterior edge); and H. yacopiae (n=78) is distinguished by the following autopomorphic characters: first laterosensorial infraorbitals canal in contact with the posterior end of antorbital (vs. laterosensorial canal not reaching posterior end of antorbital), by the tip of the supraoccipital spine widened (vs. supraoccipital spine acute), by the posterior end of ectopterygoids failing to come in contact with the quadrate bone (vs. in contact); by the posterior edge of palatine more widened than the anterior edge of ectopterygoids (vs. posterior edge of the palatine approximately the same size, except for H. paez). Rev. Biol. Trop. 58 (1): 339-356. Epub 2010 March 01.
Cinco nuevas especies son descritas para la cuenca del Río Magdalena, Colombia, con base en caracteres morfométricos, merísticos y osteológicos. Hemibrycon paez se distingue por el número de escamas en la línea lateral (39 a 42 vs. 43 a 54), entre la línea lateral y el origen de la aleta anal (6 a 7 vs. 4 a 5), y entre la línea lateral y el origen de la aleta dorsal (6 a 7 vs. 8). H. quindos se distingue por una autopomorfia: machos con protuberancias cartilaginosas redondeadas sobre los radios ramificados de la aleta anal, sobre toda su extensión (vs. no presentes en los radios de las aletas anal en machos), la maxila que no posee un plegamiento en su extremo posterior (vs. maxilar con doblamiento en su extremo posterior), por el número de escamas con poros en la línea lateral (35 a 40 vs. 40 a 46). H. raqueliae, se distingue por presentar el primer diente del maxilar ensanchado al comparar con los demás dientes que disminuye abruptamente en tamaño (vs. Primer diente del maxilar delgado, los demás dientes disminuyen gradualmente), por presentar el primer diente de la maxila pentacúspide y más ancho que los demás (vs. primer diente sobre la maxila uni o tricúspide y de igual tamaño que los otros. H. virolinica se distingue por poseer en el extremo posterior del extraescapular una espina que sobre pasa el postemporal (vs. extremo posterior del extrascapular no sobre pasa la espina del postemporal), por tener el extremo posterior del primer pterigióforo proximal de la aleta dorsal del mismo tamaño que el borde anterior (vs. el extremo posterior del primer pterigióforo proximal de la aleta dorsal mas alargado que el borde anterior). H. yacopiae se diferencia por una autopomorfia: el canal laterosensorial sobre primer infraorbital en contacto con el extremo posterior del antorbital (vs. el canal laterosensorial no alcanza el extremo posterior del antorbital), por el extremo de la espina supraoccipital ancha (vs. espina supraoccipital aguda), por el extremo posterior del ectopterigoide no en contacto con el cuadrado (vs. en contacto), por el borde posterior del palatino más ancho que el borde anterior del ectopterigoide (vs. borde posterior del palatino aproximadamente del mismo tamaño).
Assuntos
Animais , Masculino , Peixes/anatomia & histologia , Peixes/classificação , Colômbia , RiosRESUMO
We analyzed the variation in morphological and osteological characteristics of Hemibrycon boquiae and Hemibrycon rafaelense in the Cauca River. The multivariate analysis determined populations of H. boquiae in nine streams: Boquier, Honda, Las Aguilas, Doña Juana, Villa Paola, Portachuelo, The Snake, Aimes and Ramirez, and populations of H. rafaelense in four streams: Canceles, Clara, San Rafael and San Jose. There were morphometric differences among populations of H. boquiae (n = 277) and H. rafaelense (n = 121). Nevertheless, there were significant meristic discrepancies among populations of both species: number of scales between lateral line and anal fin, and number of scales between lateral line and pelvic fin. The absence of bilateral symmetry was observed in the number of maxillary teeth in H. boquiae. The cluster analysis distance for osteological characters, including the number of predorsal scales, separated H. boquiae and H. rafaelense in two defined groups.
Assuntos
Peixes/anatomia & histologia , Rios , Animais , Colômbia , Peixes/classificaçãoRESUMO
Morphological variation in populations of Hemibrycon boquiae and H. rafaelense from Rio Cauca, Colombia. We analyzed the variation in morphological and osteological characteristics of Hemibrycon boquiae and Hemibrycon rafaelense in the Cauca River. The multivariate analysis determined populations of H. boquiae in nine streams: Boquier, Honda, Las Aguilas, Doña Juana, Villa Paola, Portachuelo, The Snake, Aimes and Ramirez, and populations of H. rafaelense in four streams: Canceles, Clara, San Rafael and San Jose. There were morphometric differences among populations of H. boquiae (n= 277) and H. rafaelense (n= 121). Nevertheless, there were significant meristic discrepancies among populations of both species: number of scales between lateral line and anal fin, and number of scales between lateral line and pelvic fin. The absence of bilateral symmetry was observed in the number of maxillary teeth in H. boquiae. The cluster analysis distance for osteological characters, including the number of predorsal scales, separated H. boquiae and H. rafaelense in two defined groups. Rev. Biol. Trop. 57 (3): 541-556. Epub 2009 September 30.
Analizamos la variación morfológica y osteológica en Hemibrycon boquiae y H. rafaelense en la cuenca del río Cauca. Los análisis multivariados determinan poblaciones de H. boquiae en las quebradas: Boquiae, Honda, Las Águilas, Doña Juana, Villa Paola, Portachuelo, La Víbora, Aimes y Ramírez y poblaciones de H. rafaelense en las quebradas: Canceles, La Clara, San Rafael y San José. No hay diferencias en la morfometría entre las poblaciones de H. boquiae y H. rafaelense. Se presentan discrepancias merísticas significativas para las poblaciones de H. boquiae (n= 277) y H. rafaelense (n= 121) en: número de escamas entre la línea lateral y la aleta anal, y número de escamas entre la línea lateral y la aleta pélvica. La distancia de similaridad del análisis de agrupamiento ("cluster") para los caracteres osteológicos, al igual que el número de escamas predorsales, apoyan la existencia de dos grupos discretos que corresponden a H. boquiae y H. rafaelense.