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Strictly speaking, Semenya is NOT a hermaphrodite, she is a pseudohermaphrodite (which is itself an inadequately broad term).

Therefore, she must have, at worst, ambiguous genitalia, which would suggest pseudohermaphroditism (a very broad term indeed).

The classification of these intersex disorders is actually very complex, but it’s important, because the eventual decision that gets made is influenced by it.

Be it doping in sport, hot topics like Caster Semenya or Oscar Pistorius, or the dehydration myth, we try to translate the science behind sports and sports performance. Here in South Africa, local media coverage has been dominated by the reports that Semenya is a hermaphrodite who has internal testes, but no uterus or ovaries.

Land snails and earthworms are hermaphrodites, which makes sense because they move rather slowly and therefore have fewer opportunities to find a mate. If this is what you mean, the probable answer is that simultaneous hermaphroditism is something that hasn't existed in the verterbrate ancestral lineage for a very long time, if ever, and therefore it needs to "re-evolve." Given that vertebrates are highly mobile and therefore have frequent opportunities to mate, it seems unlikely to happen."I can't think of any large (larger then a small rodent) hermaphrodite species, or any that we tend to think of as having complex structures; hermaphrodite species all seem pretty boring really." !!! (Like, I remember trying to get a satisfactory answer from my grade 12 bio teacher.) But it seems like the community in general isn't quite getting the intent, the way you phrased it (it makes perfect sense to me, but then, we're obviously in the same mindspace on this point already).

I mean even Obligate parthenogenesis has evolved separately many larger specie like lizards, despite it arguably being an evolutionary dead end in the long term due to the lose of the advantages of sexual reproduction.

If adaptations that completely toss away the power of sex evolve all over the place why do new hermaphrodite species never seem to evolve, and existing hermaphrodite species never seem to grow bigger or more diverse?

The diagram below shows how ‘normal’ physiology is that an XY combination produces a male with testes, and an XX gives a female with ovaries, but that AIS, and a few other chromosomal abnormalities (XXY, XO, mosaicism) and enzyme deficiencies can lead to the intersex condition, where the genitalia are ambiguous and the genetic sex does not match the physical appearances.