Quitando las rayas a la cebra: dos nuevas especies de Characidium (Characiformes: Crenuchidae) de las cuencas de los ríos Paraná y Uruguay

Autores/as

DOI:

https://doi.org/10.30550/j.azl/2374

Palabras clave:

Characidiinae, especies crípticas, cuenca del Plata, taxonomía integrativa, Neotropical

Resumen

Un análisis taxonómico integrativo basado en datos morfológicos y moleculares revela la presencia de dos nuevas especies de Characidium de las cuencas de los ríos Paraná y Uruguay. Estos nuevos taxa fueron identificados históricamente de manera indistinta como Characidium cf. zebra o Characidium fasciatum. Sin embargo, la evidencia biogeográfica, morfológica y molecular indica que se encuentran filogenéticamente más próximos a Characidium borellii que a las especies del complejo C. zebra. Ambas especies se distinguen de sus congéneres por una combinación única de caracteres: istmo completamente escamado, línea lateral completa, 14 escamas alrededor del pedúnculo caudal, dos hileras de dientes dentarios, aletas mayoritariamente hialinas, barras transversales oscuras regulares en el cuerpo, la presencia de la rama parietal del canal supraorbital y por caracteres osteológicos específicos. Ambas especies se distinguen entre sí por el número de radios de la aleta pectoral (13–14 vs. 12 o menos), patrones de coloración (una banda longitudinal difusa vs. una bien definida) y características anatómicas internas, específicamente el número de aberturas del pseudotímpano, el tamaño de la vejiga natatoria y el conteo de vértebras. Además, aportamos datos sobre su posición filogenética, dimorfismo sexual, variación morfológica y estado de conservación. Estos hallazgos resaltan una diversidad de Characidium previamente no reconocida dentro de la cuenca baja del Plata.

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Quitando las rayas a la cebra: dos nuevas especies de Characidium (Characiformes: Crenuchidae) de las cuencas de los ríos Paraná y Uruguay

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2026-06-24

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Mettola, V. E., Terán, G. E., Serra, W. S., Aguilera, G., Montes, M. M., Benitez, M. F. ., Alonso, F., Ruíz Díaz, F., & Mirande, J. M. (2026). Quitando las rayas a la cebra: dos nuevas especies de Characidium (Characiformes: Crenuchidae) de las cuencas de los ríos Paraná y Uruguay. Acta Zoológica Lilloana, 281–332. https://doi.org/10.30550/j.azl/2374
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