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Piophila casei has been reported repeatedly, but incorrectly, to have only a single spermatheca—an extremely rare condition in the higher flies. This error is based on the misinterpretation of the large sclerotized ventral receptacle as a single spermatheca combined with the failure to detect the two present but unsclerotized spermathecae. This misconception is of importance not only in the context...
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