genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial n ...
of
sea catfish
The Ariidae or ariid catfish are a family of catfish that mainly live in marine waters with many freshwater and brackish water species. They are found worldwide in tropical to warm temperate zones. The family includes about 143 species.
Taxon ...
es. The three species in this genus exclusively inhabit
fresh water
Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salts and other total dissolved solids. Although the term specifically excludes seawater and brackish water, it does incl ...
and Guatemala. The individual species have relatively small ranges. The highly endangered '' Paragenidens grandoculis'' of Brazil was long classified in ''Potamarius'', but a 2019 study has found it to belong in its own genus.
Species
There are currently three described species in this genus:
* ''
Potamarius izabalensis
''Potamarius izabalensis'' is a species of catfish in the family Ariidae. It was described by Carl Leavitt Hubbs and Robert Rush Miller in 1960, originally under the genus ''Arius''. It is known to inhabit Izabal Lake in Guatemala, and possibl ...