Histomorphological studies are of great importance to know the characteristics of different tissues in different animal species. This has a special relevance in those species of which there is insufficient and / or outdated information. At the moment there are no descriptions on the morphology of the placenta and the attached membranes in the South American fur seal Peruvian sub population (Arctocephalus australis). Considering that this is one of the two species of pinnipeds that exist in Peru and added to the fact of historical population reductions caused mainly by anthropogenic factors and environmental changes such as the El Niño phenomenon (ENSO's), it is important to study their reproductive characteristics. In this sense, the study of placentas and adnexal membranes provides relevant information on the relationship and exchange that exists between the mother and the offspring. This relationship on its part could have implications for the reproductive success and birth of the concept. That is why in this work we will seek to describe the main morphological characteristics of the placenta and fetal membranes in South american fur seal (Arctocephalus australis). This is expected to detail certain similarities with placentas of other pinnipeds as well as characteristics of the species under study