The fern "Osmunda claytoniana" is a paramount example of evolutionary stasis; paleontological evidence indicates it has remained unchanged, even at the level of fossilized nuclei and chromosomes, for at least 180 million years.
The fern "Osmunda claytoniana" is a paramount example of evolutionary stasis. It has remained unchanged, even at the level of fossilized nuclei and chromosomes. This was for at least 180 million years. This is what paleontological evidence indicates.