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Primates are quite unique among placental mammals in that the two extreme types of placentation are present within a single order. Strepsirrhines (lemurs and lorisiforms) have non-invasive epitheliochorial placentation, whereas haplorhines (tarsiers and higher primates) have highly invasive haemochorial placentation. Resemblance in placenta type in fact provided the first evidence that tarsiers are...
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