2024
DOI: 10.1111/jfb.15738
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A new characid species with remarkable sexual dimorphism (Characiformes: Characidae: Stevardiinae) from the upper Guayabero River, Orinoco basin, Colombia

Tiago P. Carvalho,
Andréa Tonolli Thomaz,
Alexander Urbano‐Bonilla
et al.

Abstract: A new species of characid with remarkable sexual characteristics is described from the upper Guayabero River drainage from the Orinoco basin in Colombia. The new species is included in the genus Monotocheirodon by sharing most of the previously proposed diagnostic features of this genus. It differs from all Stevardiinae by the combination, in adult males, of an enlarged urogenital papilla in contact with the first anal‐fin unbranched ray and a highly modified anal fin with enlarged and distally elongated first… Show more

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