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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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Scanning electron micrographs of P. dumerilii pygidium at different stages of the life cycle. A: pygidium of the 3-day larva, view from the dorsal side. Arrows show developing pygidial cirri. B: pygidium of the 4-segmented larva, view from the dorsal side. C: posterior part of the young atokous worm, view from the ventral side. D: dorsal view of epitokous female worm pygidium. E: pygidium of epitokous male worm, view from the dorsal side. F: posterior part of the worm after caudal regeneration, view from the dorsal side. Numbers in A and B mark chaetigerous segments in the antero-posterior direction. Arrowheads point the position of the anus. Asterisks show bases of pygidial cirri. Dotted lines show the borders of the segment addition zone. Pyg – pygidium; cp – pygidial cirri; fp – finger-like protrusions of mature male pygidium.