Horses, unlike humans, have an epitheliochorial placenta which prevents the transfer of antibodies to the foal in-utero.
2.
However, unlike eutherian mammals, epitheliochorial placentation is not maintained by maternal tissue as embryos do not readily invade maternal tissue outside of the uterus.
3.
A common process is especially suggested by observations in animals with an epitheliochorial placenta like pigs and camels : here, the epithelium is not breached and the mature placenta consists of extensive interdigitation of very long trophoblastic and uterine epithelial microvilli throughout pregnancy.
4.
Most reptiles exhibit strict epitheliochorial placentation ( e . g . " Pseudemoia entrecasteauxii ) " however at least two examples of endotheliochorial placentation have been identified ( " Mabuya " " sp . " and " Trachylepis ivensi " ).
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