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cenogénesis

Introduction during embryonic development of characters or structure not present in the earlier evolutionary history of the strain or species (such as the addition of the placenta in mammalian evolution)

cenogénesis
1
Thus the apparent exceptions to the law can always be traced to cenogenesis.
The Evolution of Man — Volume 1
2
Such inference becomes more or less precarious when there has been cenogenesis, or disturbance of development, owing to fresh adaptations.
The Evolution of Man — Volume 2
3
By cenogenesis we understand those embryonic processes which we cannot directly correlate with corresponding evolutionary processes, but must regard as modifications or falsifications of them.
The Evolution of Man — Volume 2
4
Fleischmann points out the exceptions which Haeckel attributes to "Cenogenesis," (that is to falsification) and shows the disagreement among contemporary naturalists regarding this fundamental principle.
At the Deathbed of Darwinism: A Series of Papers