All stages of the life cycle except the fusion of micro- and macrogametes (male & female gametes) to create the karyosome are halpoid = n. The karyosome is 2n thus diploid and return to n by reduction and segregation. Meiosis can be defined by its reduction division. You must be careful how you use terms some of which are synonyms. Gametic meiosis has the reduction of the somatic 2n state to gametes of n or half. Zygotic meiosis has the reduction of the doubled karyosome (2n) to the somatic state of n. When as in Entamoeba histolytica and Giardia lamblia no sexual cycle exists, whether they are diplonts or haplonts is obviously irrelevant. These 2 genera belong to Eimeriidae and the choice of synonyms might run as: The zygote (karyosome) produces sporoblasts which in their own membranes create 2, 4, 8 or even 16 sporozoites. Is meront = sporoblast? Is sporozoite = merozoite?