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Of or relating to a kind of placentation where the chorionic villi are in contact with the endothelium of maternal blood vessels. quotations examples
Specialized hemophagous regions are a striking characteristic of some of these placentas yet absent in hyraxes, elephant shrews, and golden moles. It is possible that the common ancestor of the Afrotheria had an endotheliochorial placenta.
2004, “Placentation in species of phylogenetic importance: the Afrotheria”, in Animal Reproduction Science