Ruminantia placenta cotyledonary placenta A placenta in which the villi clumped together into circular patches called cotyledons. The fetal cotyledon meets with maternal regions called caruncles to form the placentome where maternal-fetal exchanges take place. Multiple, discrete areas of attachment called cotyledons are formed by interaction of patches of allantochorion with endometrium. The fetal portions of this type of placenta are called cotyledons, the maternal contact sites (caruncles), and the cotyledon-caruncle complex a placentome UBERON:0036152 common to ungulates such as cows, deer, goat, and giraffes