It is recorded in insects (esp. lepidopterans), arachnids, crustaceans, and birds. I read of one possible case in a cat. The chickens were found to be ZZ|ZW. In humans, I do not think that the equivalent exists; for example, Klinefelter syndrome involves mosaicism of sex chromosome trisomy or tetrasomy.
But the mechanism, and especially the genotype would be different. And anyway, I have never heard of any human intersex cases with such marked bilateralism as observed in birds and invertebrata. Maybe there are anterio-posterior cases.
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Look a lobster!
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That lobster looks like it has other problems, too. Does it have two faces??
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I was looking at the wrong thing, LOL. I didn't notice that his/her eyes were farther back on his/her head. Whoops!
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