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. 2019 Oct 24;16:39. doi: 10.1186/s12983-019-0337-6

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — Palpal organ of Hypochilus pococki; external morphology (a), histology (c), ultrastructure documented by TEM (d, e), and 3D reconstruction of the spermophor (green) and nervous tissue (yellow) as based on segmentation of histological image stacks (b). The arrow indicates the plane chosen for semithin section (a). The arrowhead marks the terminals of the bulb nerve and associated neurons (b). The box marks the cluster of neuronal somata, and ultrastructural details of neurites bundles (d) associated with cluster of neuronal somata (e). Abbreviations: HV Haemolymph Vessel, Cy Cymbium, E Embolus, GE Glandular epithelium, Gli Glial cell processes, Mt Mitochondria, Ne Neurite, N Nucleus of a neuron, S Spermophor, SC Cluster of neuronal somata, SF Seminal fluid