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. 2015 Jan 13;1:2. doi: 10.1186/s40851-014-0007-7

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© Hirasawa and Kuratani; 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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Distribution of endoskeletons (endo) and exoskeletons (exo) in the vertebrate body. (A) Osteostracan Cephalaspis (redrawn from [13]). (B) Basal jawed vertebrate Compagopiscis (redrawn from [14]). (C) Temnospondyl tetrapod Dendrerpeton (redrawn from [15]).