''Paragenidens'' is a

monotypic In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispec ...

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

of sea catfishes containing just one

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 ...

, ''Paragenidens grandoculis.'' This species was formerly classified under the genus ''

Potamarius ''Potamarius'' is a genus of sea catfishes. The three species in this genus exclusively inhabit fresh water in southern Mexico and Guatemala. The individual species have relatively small ranges. The highly endangered '' Paragenidens grandoculis ...

'' until a 2019 study found it to be wholly distinct from it. It is

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...

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 ...

, where it is known from the

Doce Doce was a Portuguese female band from the 1980s. It was one of the first girl bands in Europe. The girls took part in the Portuguese national final in order to represent the country in the Eurovision Song Contest 1980 with the song "Doce" ("S ...

and the

Paraíba do Sul The Paraíba do Sul (), or simply termed Paraíba, is a river in southeast Brazil. It flows west to northeast from its farthest source at the source of the river Paraitinga to the sea near Campos dos Goytacazes. The river receives its name when ...

rivers and their mouths. It is highly endangered and was not seen for over 50 years until it was rediscovered during fieldwork for the 2019 study that reclassified it. It is now only known from Lagoa Nova in the municipality of

Linhares Linhares is the name of a municipality in the state of Espírito Santo, Brazil, north of the state capital, Vitória. It is the largest municipality by area in the state, at 9,501.6 km², and has a population of 176,688 people (2020). The ...

Espirito Santo ''Espirito'' (Brazilian for "Spirit") is the second album by Lawson Rollins. Rollins composed all of the music and co-produced the album with Persian-American musician and producer Shahin Shahida (of Shahin & Sepehr) and multi-platinum producer Do ...

state, having been extirpated from its only other recent locality, Lagoa Juparanã in Linhares.

References

{{Taxonbar, from=Q65065322 Catfish genera Ariidae Monotypic fish genera