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Scanning electron micrographs of rod-shaped bacteria associated with the hindgut cuticle of P. scaber showing (A) a colonized gut surface and the connection between the rod-shaped bacteria and the tips of cuticular spines (arrows) via spherical structures (arrowheads) and (B) a group of rod-shaped bacteria attached to a single cuticular spine (arrows) forming a rosette-like structure. Scale bars = 2 μm.
