“Living fossils”, still reproducing and subject to evolution, but it’s interesting that they still look like the fossils we find of them.

I don’t know how many are actually afflicted with the misunderstanding that these living fossils are individually as old as the fossils we find of their ancestors, but I think “they basically haven’t changed” and “even through the pressures of evolution which they are definitely not exempt from, they have retained most of their features because they still work” are close enough for a layman.