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Thanks for the explanation Mark. I'd guessed from your comment that the larvae of some genera must emerge in faeces before pupation, though not this one nor Dermatobia hominis, the human bot fly that I suffered from. No doctor would believe the life cycle I described to them, which involves hi-jacking mosquitos (usually) to vector their eggs to people (http://en.wikipedia.org/wiki/Dermatobia_hominis). Parasites are so devious!