''Proterorhinus semipellucidus '' is a

species In biology, a species is the basic unit of Taxonomy (biology), 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 ...

of gobiid fish, a

tubenose goby ''Proterorhinus'' is a genus of fishes, known as the tubenose gobies. These gobiid fish are native to Eurasia where they occur in the region of the Caspian and Black seas, inhabiting marine, brackish and fresh waters. The species ''Proterorhi ...

originally described from the Gharasu River near

Gorgan Bay The Gulf of Gorgan ( fa, خلیج گرگان), also known as Gorgan Bay, is the largest gulf in the Caspian Sea. It is located at the south-eastern shore of the Caspian Sea near the cities of Behshahr, Gorgan and Sari in Iran Iran, ...

of the

Caspian Sea The Caspian Sea is the world's largest inland body of water, often described as the List of lakes by area, world's largest lake or a full-fledged sea. An endorheic basin, it lies between Europe and Asia; east of the Caucasus, west of the broad s ...

in Iran. Following the systematic decomposition of the tubenose gobies it was suggested to be a more widespread and invasive taxon distributed in the

fresh water 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 incl ...

s of the

basin.Neilson M.E., Stepien C.A. (2009) Evolution and phylogeography of the tubenose goby genus ''

Proterorhinus ''Proterorhinus'' is a genus of fishes, known as the tubenose gobies. These gobiid fish are native to Eurasia where they occur in the region of the Caspian and Black seas, inhabiting marine, brackish and fresh waters. The species ''Proterorhinus ...

'' (

Gobiidae Gobiidae or gobies is a family of bony fish in the order Gobiiformes, one of the largest fish families comprising more than 2,000 species in more than 200 genera. Most of gobiid fish are relatively small, typically less than in length, and t ...

Teleostei Teleostei (; Greek ''teleios'' "complete" + ''osteon'' "bone"), members of which are known as teleosts ), is, by far, the largest infraclass in the class Actinopterygii, the ray-finned fishes, containing 96% of all extant species of fish. Tele ...

): evidence for new cryptic species. Biological Journal of the Linnean Society, 96(3): 664–68

/ref> It may be the same species as that known as ''

Proterorhinus nasalis The eastern tubenose goby (''Proterorhinus nasalis'') is a species of gobiid fish native to fresh and brackish waters of the basins of the Sea of Azov and the Caspian Sea and has invaded the upper reaches of the Volga River from its native o ...

''.Brian W. Coad
Freshwater Fishes of Iran
(accessed 22 Feb 2015)

References

External links

* Eschmeyer, William N. (2015
semipellucidus, Gobius
In ''

Catalog of Fishes Catalog of Fishes is a comprehensive on-line database and reference work on the scientific names of fish species and genera. It is global in its scope and is hosted by the California Academy of Sciences. It has been compiled and is continuously u ...

''. California Academy of Sciences. (accessed 22 Feb 2015) semipellucidus Fish of Asia Fish of Russia Fish of the Caspian Sea Fish described in 1877 {{Gobiidae-stub