The most primitive type of mammalian placenta is

Syndesmochorial

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Endotheliochorial

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Haemochorial

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Epithelicohorial

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Solution

The correct option is D Epithelicohorial
Epitheliocohorial type of mammalian placenta is observed in cattle, pigs etc
wherein the chorion is superficially aligned on the endometrium and does not penetrate it.
So, the correct answer is 'Epithelicohorial'

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