''Cathorops agassizii'' is a

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

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. Taxono ...

in the family Ariidae. It was described by Carl H. and

Rosa Smith Eigenmann Rosa Smith Eigenmann (October 7, 1858 – January 12, 1947) was an American ichthyologist (the branch of zoology devoted to the study of fish), as well as a writer, editor, former curator at the California Academy of Sciences, and the first libra ...

in 1888, originally under the genus '' Tachisurus''.Eigenmann, C. H. and R. S. Eigenmann 1888 (18 July) ef. 1249''Preliminary notes on South American Nematognathi.'' I. Proceedings of the California Academy of Sciences (Series 2) v. 1 (pt 2): 119-172. It is a tropical

freshwater 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 include ...

fish which is known from

Guyana Guyana ( or ), officially the Cooperative Republic of Guyana, is a country on the northern mainland of South America. Guyana is an indigenous word which means "Land of Many Waters". The capital city is Georgetown. Guyana is bordered by the ...

and

Brazil Brazil ( pt, Brasil; ), officially the Federative Republic of Brazil (Portuguese: ), is the largest country in both South America and Latin America. At and with over 217 million people, Brazil is the world's fifth-largest country by area ...

. It reaches a maximum length of .

References

Ariidae Fish described in 1888 Taxa named by Rosa Smith Eigenmann Taxa named by Carl H. Eigenmann {{Ariidae-stub