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. 2015 Feb 25;15:25. doi: 10.1186/s12862-015-0299-z

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© Starunov et al.; licensee BioMed Central. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. 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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Ultrastructure of P. dumerilii pygidial cavity inlay. A: Scanning electron micrograph of sagittal dissection of posterior part of the worm showing pygidial cavity (arrowheads) and segmental coeloms (sc). B: Closer view of the ventral part of the pygidial cavity (rectangle selection in A) showing inlay cells. C-G: Transmission electron micrographs of different parts of the pygidial cavity inlay. C-D: Different kinds of myoepithelial cells, red arrowhead marks thin cytoplasmic lamella connecting two parts of the cell; E: visceral myoepithelium and blood vessels; F: Adherens junctions between myoepithelial cells (arrowheads). G: Hemidesmosomes, attaching myoepithelial cells to the basal membrane (arrowheads). an – anus; bs – perianal blood sinus; cav – pygidial cavity; dbv – dorsal blood vessel; ecm – extracellular membrane; gl – pygidial glands; in – intestine; n – cell nucleus; sc – segmental coeloms.