''Paracobitis rhadinaea'', or the Easted crested loach, is a species of

stone loach The stone loach (''Barbatula barbatula'') is a European species of fresh water ray-finned fish in the family Nemacheilidae. It is one of nineteen species in the genus '' Barbatula''. Stone loaches live amongst the gravel and stones of fast flowi ...

the

Sistan basin The Sistan Basin is an inland endorheic basin encompassing large parts of southwestern Afghanistan and minor parts of southeastern Iran. It is one of the driest regions in the world and an area subject to prolonged droughts. Its watershed is a ...

Iran Iran, officially the Islamic Republic of Iran (IRI) and also known as Persia, is a country in West Asia. It borders Iraq to the west, Turkey, Azerbaijan, and Armenia to the northwest, the Caspian Sea to the north, Turkmenistan to the nort ...

and

Helmand River The Helmand river (Pashto/Dari: ; Ancient Greek: Ἐτύμανδρος, ''Etýmandros''; Latin: '), also spelled Helmend, or Helmund, Hirmand, is the longest river in Afghanistan and the primary watershed for the endorheic Sistan Basin. It o ...

in Afghanistan. This species reaches a length of . It is known from minor morphological differences between specimens.

References

rhadinaea ''Rhadinaea'' is a genus of snakes of the family Colubridae.. Species The following 21 species are recognized as being valid. *''Rhadinaea bogertorum'' – Oaxacan graceful brown snake *'' Rhadinaea calligaster'' – thick graceful brown snake ...

Fish of Asia Fish of Iran Fish of Afghanistan Taxa named by Charles Tate Regan Fish described in 1906 {{Nemacheilidae-stub