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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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Ventral side of thorax and pygidium of Arthroaspis bergstroemi n. gen. n. sp. MGUH 30406, specimen with ‘folded over’ cephalon, part and counterpart. A. ventral aspect; A₁, overview showing sternites and extent of appendages; A₂, close up of abaxial region, showing distal lobes of exopods; A₃ close up, arrows point to spines on basipod; B. counterpart to specimen in A; B₁ detail of midventral region with sternites and basipod spines (arrows); B₂, sternites and impressions of exopod lamellae.