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. 2020 Dec 17;11:606575. doi: 10.3389/fphys.2020.606575

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Copyright © 2020 Song, Wang, Liu, Sun and Ban.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Ultrastructure of placoid sensilla on the 6th antennal segment of spotted alfalfa aphid. (A) The sensillum bears many pores on the surface. (B) Pores on the sensillum surface perforate the outer cuticle. (C) The dendrites of the sensillum are clustered into three groups, two of them containing three neurons while the other one only with two. (D) Each dendrite group was covered by dendritic sheath. (E) Each group of dendrites is subdivided into inner and outer segments by a short ciliary region. D, dendrite; Ds, dendritic sheath; V, vacuole; Tr, trichogen cell; P, pore; Oc, outer cuticle; Ic, inner cuticle; Ci, cilium.