Abstract
The karyotype of an endemic Iranian fish, Cyprinion tenuiradius Heckel, 1849, has been investigated by examining metaphase chromosome spreads obtained from gill epithelial and kidney cells. The diploid chromosome number is 2n=50. The karyotypes consist of 13 metacentric, 5 submetacentric and 7 subtelocentric chromosome pairs. The arm number is NF=86. Sex chromosomes are cytologically indistinguishable in this species. The chromosome number in this fish is the same as in many other cyprinid fishes, confirming the conservative character of this feature in the family.
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