Allopatric speciation is duh, but sympatric speciation is confusing as hell. Well, skimming wikipedia, it seems like nobody understands it.
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I guess I feel better about it now.
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There's a wasp species that is bisected by a virus. Wasps with the virus can mate, w/o can mate, but no combinations are fertile.
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@slatestarcodex can you explain how asexual beings became sexual? What does refinement of sexual organs look like over time? -
Very long story but "asexual" organisms, particularly unicellular, can still trade DNA more or less by accident.
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This can be advantageous, so successful "accidental" DNA swappers get selected for doing it less accidentally.
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From there it's continuous improvement and variation.
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Some advanced cases have been spotted in the wild.
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. Banned in Sweden. SubGenius, Zhuangist, white-hat troll. Defrocked mathematician. Brain problems.