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SEM images of the labellum and prestomal teeth of generalist-flower visiting species. (A,B) The labellum of Sarcophaga bullata shows prestomal teeth (Pt) and pseudotracheae (Ps). The primary prestomal teeth are false-colored in yellow, secondary teeth are red (St in (B)), and tertiary prestomal teeth (third row of teeth) are shown in blue (Tt in (B)). (C,D) The labellum and prestomal teeth of Pollenia pediculata.
