@article{porto_feldberg_1993,  title={IS <i>Callichtys  </i> LINNÉ (OSTARIOPHISY, SILURIFORMES, CALLICHTHYIDAE) A MONOTYPIC GENUS?},  volume={23},  ISSN={0044-5967},  url={https://doi.org/10.1590/1809-43921993233314},  DOI={10.1590/1809-43921993233314},  number={2-3},  journal={Acta Amazonica},  publisher={Instituto Nacional de Pesquisas da Amazônia},  author={PORTO, Jorge Ivan Rebelo and FELDBERG, Eliana},  year={1993},  pages={311–314} }