part of part of in taxon results in development of placenta development maternal placenta development decidua development GO:0001893 Maternally driven process whose specific outcome is the progression of the placenta over time, from its formation to the mature structure. The placenta is an organ of metabolic interchange between fetus and mother, partly of embryonic origin and partly of maternal origin. developmental process involved in reproduction anatomical structure development maternal process involved in female pregnancy Theria <mammals> decidua