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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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Sternites of Arthroaspis bergstroemi n. gen. n. sp. A. MGUH 30410 (pt), ventral side of thorax, showing hourglass shaped sternites with sclerotized half-rings in adjacent arthrodial membrane of body-limb joints (ventral aspect, light from NE); B. MGUH 30392 ventral side of thorax and anterior pygidial region, showing sternites, body-limb joints and intersegmental tendon (ventral aspect). B₂ detail of internal sculpture of cuticle of pygidium, cf Figure 3A; note segmental boundaries in inner lamella (arrows).