Meristic and morphometric characteristics, including otolith data, of the Farsi tooth‐carp Aphanius farsicus , which is endemic to the endorheic Maharlu Basin in south‐western Iran, were analysed for a sample of 92 individuals from four spring‐streams; DNA sequence data (cytochrome b gene) are presented for 29 specimens. Some phenotypic variation was detected but the genetic data clearly indicate connectivity between the popul...