Fossil Wasp (NOT to scale!) from Eocene lake beds at Florissant Fossil Beds National Monument. (photo by Bud Wobus).
Very dang cool. Link goes to the original photo.
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The biological species concept defines a species as members of populations that actually or potentially interbreed in nature, not according to similarity of appearance.To that we probably need to add that the offspring can, themselves, reproduce but you get the idea. Here's the problem.... "similarity of appearance" is really all we have in Paleontology. You take two fossils, put then on a water bed, give them some privacy and cue the Barry White. Come back a month later and there are still just going to be two fossils there. FOSSILS DON'T REPRODUCE. In fact we can't be really sure those two fossils were the opposite sex. (not that there's anything WRONG with same sex fossils) . So what do we do about the species concept in paleontology?... basically we muddle through as best we can mainly relying on appearance.