''Potamarius'' is a

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

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. Fossil ...

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 salt (chemistry), salts and other total dissolved solids. The term excludes seawater and brackish water, but it does include ...

in southern

Mexico Mexico, officially the United Mexican States, is a country in North America. It is the northernmost country in Latin America, and borders the United States to the north, and Guatemala and Belize to the southeast; while having maritime boundar ...

and

Guatemala Guatemala, officially the Republic of Guatemala, is a country in Central America. It is bordered to the north and west by Mexico, to the northeast by Belize, to the east by Honduras, and to the southeast by El Salvador. It is hydrologically b ...

. 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'' C. L. Hubbs & R. R. Miller, 1960 * '' Potamarius nelsoni'' ( Evermann & Goldsborough, 1902) (Lacandon sea-catfish) * '' Potamarius usumacintae'' Betancur-R. &

Willink Willink is a Dutch toponymic surname. Notable people with the surname include: * Abraham Willink (1920–1998), Dutch-Argentine entomologist * Arthur Willink (1850–1913), British theologian and clergyman * Carel Willink (1900–1983), Dutch paint ...

, 2007 (Usumacinta sea-catfish)

References

Ariidae Catfish genera Taxa named by Carl Leavitt Hubbs Taxa named by Robert Rush Miller {{Ariidae-stub