@article{vari_ferraris jr._2009,  title={New species of Cetopsidium (Siluriformes: Cetopsidae: Cetopsinae) from the upper rio Branco system in Guyana},  volume={7},  ISSN={1679-6225},  url={https://doi.org/10.1590/S1679-62252009000300001},  DOI={10.1590/S1679-62252009000300001},  number={3},  journal={Neotropical Ichthyology},  publisher={Sociedade Brasileira de Ictiologia},  author={Vari, Richard P. and Ferraris Jr., Carl J.},  year={2009},  month={Sep},  pages={289–293} }