A Eutherian ovum is an alecithal or microlecithal ovum, characterized by having very little or no yolk, and is found in placental mammals (eutherians). This minimal yolk content is a result of eutherian mammals' reliance on the placenta to provide nutrients to the developing embryo during internal gestation, rather than on yolk for embryonic development.
Eutherian ovum is ______?
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