Abstract
ABSTRACT Historical information on the probable type-locality of Pimelodus quelen and of its four junior synonyms that share the same neotype, Pimelodus namdia, Pimelodus sebae, Heterobranchus sextentaculatus, and Silurus rivularis, is presented and discussed. The neotype designation for those four species is deemed invalid for not complying with the provisions of the International Code of Zoological Nomenclature, making it technically possible to revalidate any of the four taxa from the synonymy of Rhamdia quelen without having to address the International Commission of Zoological Nomenclature. The type-locality of both Curimata gilbert and Callichthys asper are also restricted to rio Macacu at the village of Japuíba, State of Rio de Janeiro, Brazil.
Highlights
This is the second paper in a series on the taxonomy of the genus Rhamdia Bleeker, 1858
In the first paper Koerber, Reis (2019) have provided the original descriptions and their respective English translations from either Latin, French, or German along with other relevant writings on Pimelodus quelen Quoy, Gaimard, 1824, Pimelodus namdia Cuvier, 1829, Pimelodus sebae Cuvier, 1829, Heterobranchus sextentaculatus Agassiz, in Spix, Agassiz, 1829, and Silurus rivularis Larrañaga, 1923, four of the 47 nominal species of Rhamdia that have been synonymized to R. quelen and which share the same neotype specimen designated by Silfvergrip (1996)
In his revision of the genus Rhamdia, Silfvergrip (1996) wrote “The origin of Pimelodus quelen Quoy & Gaimard, in Freycinet (1824: 228, Pl. 49 figs 3–4) was stated in the original description as ‘II provient du Brasil...” and “...the original description and the two illustrations are the only sources of information at hand”
Summary
This is the second paper in a series on the taxonomy of the genus Rhamdia Bleeker, 1858. In the first paper Koerber, Reis (2019) have provided the original descriptions and their respective English translations from either Latin, French, or German along with other relevant writings on Pimelodus quelen Quoy, Gaimard, 1824, Pimelodus namdia Cuvier, 1829, Pimelodus sebae Cuvier, 1829, Heterobranchus sextentaculatus Agassiz, in Spix, Agassiz, 1829, and Silurus rivularis Larrañaga, 1923, four of the 47 nominal species of Rhamdia that have been synonymized to R. quelen and which share the same neotype specimen designated by Silfvergrip (1996). In the present paper we present and discuss historical information on the locality where the lost type specimens of the above five species have most probably been collected, suggesting that designation of neotypes for any of them should be from the areas identified
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