I wonder if the fossil record could be examined for examples of two
related sympatric species hybridizing to such an extent that the
species with a smaller genepool becomes assimilated by the other?

It would be difficult, but basically working as the "opposite" of evolution.

The only example I know of is the assimilation of Homo
neanderthalensis by H. sapiens. However hybrid Lambis are pretty
common, so may be an example of this happening presently.

Thoughts?

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