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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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Postantennular appendages of Arthroaspis bergstroemi n. gen. n. sp. A. MGUH 30383, limb axis with body–limb joint; B. MGUH 30394, isolated limb showing proximal part of limb axis with basipod and first endopod podomere, and proximal portion of exopod, arrow marks the proximal margin of the basipod; C. MGUH 30419, proximal part of isolated limb, showing large, inward rotated basipod endite and four endopod podomeres; D. MGUH 30395, podomeres 3–6 of endopod with mediodistal spines on podomeres three and four; E. MGUH 30396, distal portion of endopod, showing distal podomere; F. MGUH 30409, impressions of limb axes with boundaries of basipod and seven podomeres discernible (ventral aspect).