- Descrito por / Described by:
Henry W. Fowler, 1940

- Nome original / Original name:
Aphyocharax gracilis

- Nome do artigo / Article name:
Zoological results of the second Bolivian expedition for the Academy of Natural Sciences of Philadelphia, 1936-1937. Part I.--The fishes.

- Publicado em / Published in:
Proceedings of the Academy of Natural Sciences of Philadelphia v. 92: 43-103.

- Localidade tipo / Type locality:
Rio Pilcomayao, Villa Montes, Bolívia. / Río Pilcomayo, Villa Montes, Bolivia.