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. 2020 Feb 6;10:1995. doi: 10.1038/s41598-020-58816-8

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Leading models of the postembryonic developments of olfactory sensilla. (A) Schematic drawing of the postembryonic development of sw-A1 sensilla. Anatomical and physiological features indicate that nymphal sw-A1 sensilla are maintained during the postembryonic development of the cockroach. (B) Schematic drawing of the postembryonic development of sex pheromone-responsive sensilla. In this study, we obtained following results. (1) Both nymphal sw-A2 and adult sw-B sensilla have common shapes of olfactory pores. (2) All recorded nymphal sw-A2 sensilla have two OSNs, and there are PB-responsive and PB-unresponsive sw-A2 sensilla in nymphs. It has been known that each sw-B sensillum has one PB-SN and three other OSNs^17,19. Furthermore, a large majority of nymphal sw-A sensilla transform to the sw-B sensilla at the final moult, and the morphogenesis is accompanied the increase of the number of OSNs²⁸. Taken together current and previous results, we hypothesized developmental schemes of the sex pheromone-responsive sensilla.