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. 2013 May 11;13:99. doi: 10.1186/1471-2148-13-99

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Copyright © 2013 Stein et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Pygidium and posterior thorax of Arthroaspis bergstroemi n. gen. n. sp. A. MGUH 30401, pygidium with posterior trunk tergites showing axial rings and segmental marginal spines of pygidium (dorsal aspect); B. MGUH 30418, pygidium with posterior trunk tergites showing axial rings, segmental marginal spines, and anterior segment of pygidium (dorsal aspect); C. MGUH 30386, disarticulated pygidium with appendages (dorsal aspect); D. MGUH 30393, anterior margin of disarticulated pygidium showing anterior segment of pygidium with articulating flanges (dorsal aspect, light from SE).