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Message: <blockquote data-quote="MBullock" data-source="post: 200715" data-attributes="member: 33994">Swollen booklung may be a sign of small-headed fly parasitoidism.  Small-headed flies attack a wide array of arachnida, but some target tarantulas exclusively- the species in north america that go after aphonopelma actually need a few years to develop-  the first larval stage is called a planidium stage which seeks the tarantula, then lodges into a booklung, then goes dormant, waiting til approximately around the ultimate molt to begin consuming its host, they probably wait.</blockquote>