''Etheostoma pallididorsum'', the paleback darter, is a species of freshwater

ray-finned fish Actinopterygii (; ), members of which are known as ray-finned fish or actinopterygians, is a class of bony fish that comprise over 50% of living vertebrate species. They are so called because of their lightly built fins made of webbings of sk ...

, a darter from the

subfamily In biological classification, a subfamily (Latin: ', plural ') is an auxiliary (intermediate) taxonomic rank, next below family but more inclusive than genus. Standard nomenclature rules end botanical subfamily names with "-oideae", and zo ...

Etheostomatinae Etheostomatinae is a species-rich subfamily of freshwater ray-finned fish, the members of which are commonly known as the darters. The subfamily is part of the family Percidae which also includes the perches, ruffes and pikeperches. The family ...

, part of the

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

Percidae The Percidae are a family of ray-finned fish, part of the order Perciformes, which are found in fresh and brackish waters of the Northern Hemisphere. The majority are Nearctic, but there are also Palearctic species. The family contains nearly 250 ...

, which also contains the

perch Perch is a common name for freshwater fish from the genus ''Perca'', which belongs to the family Percidae of the large order Perciformes. The name comes from , meaning the type species of this genus, the European perch (''P. fluviatilis'') ...

es, ruffes and pikeperches. It is

endemic Endemism is the state of a species being found only 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 foun ...

Arkansas Arkansas ( ) is a landlocked state in the West South Central region of the Southern United States. It borders Missouri to the north, Tennessee and Mississippi to the east, Louisiana to the south, Texas to the southwest, and Oklahoma ...

in the United States. It is only known to occur in the

Caddo River The Caddo River is a tributary of the Ouachita River in the U.S. state of Arkansas. The river is about long.Calculated in Google Maps and Google Earth Course The Caddo River flows out of the Ouachita Mountains through Montgomery, Pike, and C ...

and in Hallmans Creek, a tributary of the

Ouachita River The Ouachita River ( ) is a river that runs south and east through the United States, U.S. U.S. state, states of Arkansas and Louisiana, joining the Tensas River to form the Black River (Louisiana), Black River near Jonesville, Louisiana. It i ...

. This species inhabits headwaters and creeks where it lives in rocky, shallow pools and also in springs with plentiful vegetation growth. This species can reach a length of TL though most only reach about .

References

Etheostoma Endemic fauna of Arkansas Endemic fish of the United States Freshwater fish of the United States Fish of the Eastern United States Fish described in 1962 Taxonomy articles created by Polbot Ouachita River {{Percidae-stub

See also

References