Siebenrock's Caspian turtle ("M. c. siebenrocki" ) occurs in Iran and Iraq, with relict populations in Saudi Arabia and on the island of Bahrain; it intergrades with "M. c. caspica" in Mesopotamia. This light form with contrasting colors resembles "M. c. caspica", but has a yellow-to-orange plastron with a small to medium-sized, regularly shaped dark blotch on each scute. The soft parts are lighter than in "M. c. caspica", and, unlike in other subspecies, age-related melanism does not occur in this subspecies.