Parasitology aiding fish taxonomy: Hyphessobrycon nicolasi as a jr. synonym of H. meridionalis (Characiformes:Acestrorhamphidae)
Palabras clave:
Digenea, Host-parasite interaction, Melanin deposits, Parasitic infection, MorphologyResumen
This study provides strong evidence in favor of considering Hyphessobrycon nicolasi as a junior synon-
ym of Hyphessobrycon meridionalis. The analysis of the type material of H. nicolasi shows that the main diagnostic character between those species, which was based on supposed differences in coloration patterns due to the presence of an oblique black stripe along the margin of the caudal fin lobes in H. nicolasi, was in fact caused by metacercarial infection in some of the type specimens of H. nicolasi. Additionally, further examination of the types and other comparative materials did not reveal any other consistent phenotypic differentiation between these two taxa. Therefore, we consider Hyphessobrycon nicolasi as a junior synonym of Hyphessobrycon meridionalis. This finding highlights the importance of carefully considering the presence of parasites while describing new species of fishes as they can cause color changes or morphological alterations in their hosts.
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