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Stellate sensillum on the 6th antennal segment of spotted alfalfa aphid T. trifolii. (A) Scanning electron micrographs of stellate sensilla. (B) Transverse sections through the branch of the sensillum. (C,D) Transverse section showing three dendrites surrounded by the dendritic sheath (C), and the ciliary regions of the sensillum (D). D, dendrite; Ds, dendritic sheath; V, vacuole; Tr, trichogen cell; P, pore; Ci, cilium; Pt, pore tubules.
