Fig. 7.

Palpal organ of Larinia jeskovi; external morphology (a), histology (c, e), ultrastructure as documented by TEM (d), and 3D reconstruction of the spermophor (green) and nervous tissue (yellow) as based on segmentation of histological image stacks (b). Arrow in (a) indicates plane chosen for semi-thin cross section (c). Arrowhead in (b) marks terminals of the bulb nerve. Box in (c) shows position and arrangement of neurite bundles branching off the bulb nerve, boxed sector is magnified in (e). Ultrastructural details of the same sector are given in (d), note the presence of two distinct neurite bundles adhering a haemolymph vessel. Abbreviations: B Bulbus, Cy Cymbium, GE Glandular epithelium, Gli Glial cell processes, HS Haemolymph space, Htd Haematodocha, HV Haemolymph Vessel, Ne Neurite, NeB Neurite Bundles, Pcy Paracymbium, SF Seminal fluid