redescription of paracobitis rhadinaea (regan, 1906) from sistan basin, iran (teleostei: nemacheiliidae)

paracobitis rhadinaea , a member of the family nemacheiliidae, originally described by regan in 1906 from sistan basin, is poorely known by the rare materials. the inadequately studied species is redescribed on the base of freshly collected materials. the species differs from all other paracobitis species by combination of the following characters: stout and elongated body; large size, up to 288 mm; a fully squamated body; slit like posterior nare; and midlateral series of large, irregular set and shaped dark, brown blotches. p. rhadinaea is endemic to sistan, iran.