Abstract
Based on a series of 90 specimens, and using morphometric, meristic and osteological characters, a new species of the genus Bryconamericus is described from Pontesuela Creek at the mouth of Coclina Creek in the middle Magdalena river Basin of Colombia. We use box graphs with 99% confidence intervals to illustrate the extent ofmeristic character overlap and to help distinguish this new taxon from other species of the Magdalena River. The species can be distinguished from all congeners by the combination of the following characters: the higher number of lateral line scales (50-54 vs. 30-50, except B. terrabensis with 47-54); more scales between the lateral line and the dorsal fin origin (9-11 vs. 4-9); more scales between the lateral line and the pelvic fin origin (8-10 vs. 2-8); more scales between lateral line and anal fin origin (8-10 vs. 2-8, except B. terrabensis with 6-9) and more predorsal scales (16-18 vs. 9-16, except B. huilae with 14-19 scales, B. galvisi with 12-17 and B. tolimae with 13-17).
Highlights
El propósito de éste artículo es describir una nueva especie de Bryconamericus del sistema del río Magdalena y es parte de la revisión que continúa el autor (C.R-V.) sobre las especies de Bryconamericus para el norte de Sudamérica
Bryconamericus arilepis can be distinguished from all congeners by the higher number of scales: on lateral line (5054 vs. 30-50, except B. terrabensis with 47-54), between lateral line to dorsal fins origin (9-11 vs. 4-9), between lateral line and pelvic fin origin (8-10 vs. 2-8), between lateral line and anal fin origin (8-10 vs. 2-8, except B. terrabensis with 6-9) and predorsals (16-18 vs. 9-16, except B. huilae with 14-19 scales, B. galvisi with 12-17 and B. tolimae with 13-17)
Filogenia y biogeografía de las especies de peces pertenecientes al género Bryconamericus (Characiformes, Characidae) para América central y noroccidente de América del sur
Summary
Las recolecciones de los peces en la localidad típica del nuevo taxon, Quebrada La Pontesuela en la boca de la quebrada Coclina en el Magdalena medio, se realizaron con un método consistente en arrastres con una malla fina (ojo de malla 6.0 por 3.5 mm) de 3.85 m de largo por 1.65 m de ancho. Se sigue a Fink y Weitzman (1974) para la obtención de medidas con las adiciones de Román-Valencia (2003a). Se utilizó un gráfico de cajas y de intervalos de confianza al 99% para ilustrar la medida merística que mostrara menor solapamiento y distinguiera parcialmente al nuevo taxon de las otras especies del río Magdalena. Las observaciones de las estructuras óseas y cartílagos se hicieron sobre ejemplares clareados y teñidos (C. y T.) de acuerdo a modificaciones del método descrito por Taylor y Van Dyke (1985). La nomenclatura de huesos se basó en Weitzman (1962), Murray (2004) y Ruiz-C y Román-Valencia (2006)
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