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Scanning electron micrographs of coeloconic sensilla and trichoid sensilla of spotted alfalfa aphid antennae. (A,B) The coeloconic sensilla type I (A) and type II (B) on the 6th segment. (C,D) The trichoid sensilla type IA on antennal scape and pedicel (C) and trichoid sensilla type IB (D) are located from the 3rd segment to the 6th segment of antennae. (E–G) The trichoid sensilla type II (E,F) are distribution on the 6th segment tip (G). Cp, cuticular projections.
