The heterochromatic Comstockiella system, with which the Iecanoid system is usually associated, is the basic system of the section and is found in all the tribes for which sexual forms are known, as well as in the palm scales, however defined. The heterochromatic Iecanoid system has been found only once by itself, in a species of palm scale. The diaspidid system is restricted to the two major tribes of the armored scales, the Diaspidini and Aspidiotini, where it has been found in the majority of forms.
