Potamarius is a genus of sea catfishes that occur in Central and South America. The members of this genus are almost exclusively inhabit fresh water though P. grandoculis can be found in brackish water.
Species taxanomy provided by GBIF Secretariat (2022). GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei accessed via GBIF.org on 2023-06-13; License: CC BY 4.0