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- noun Plural form of
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Moreover, we have no fossil evidence of the evolution of the crossopterygians from other fish.
If crossopterygians really did evolve into amphibians, tremendous changes must have taken place.
Two large gaps thus exist in the fossil record between ordinary Devonian fish 325 million years ago and amphibians; one between ordinary fish and crossopterygians, and an even larger gap between these lobe-finned fish and amphibians.