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. 2015 Dec 19;370(1684):20150286. doi: 10.1098/rstb.2015.0286

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© 2015 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 6. — The evolution of gastric pouches. (a) Hypothetical modified gastraea with an anterior and a posterior pouch, separated by the primary mesenteries. Establishment of bilateral symmetry. Schematic lateral views (upper panels) and ventral views (lower panels). (b) Duplicated pouches leading to two bilateral sets of gastric pouches separated by mesenteries. Schematic lateral views (upper panels) and ventral views (lower panels). (c) Gbx expression in the gastric pouches of the Nematostella late planula (left) and in the amphioxus embryo (right). Midlle panels show gbx expression in a general cnidarian versus bilaterian (with slit-like blastopore). (d) The metameric gastric diverticula of Dickinsonia, adapted with permission from [161]. Stippled circle indicates inferred zone where additional diverticula have been added. (e) The metameric gastric pouches of Cerianthus, adapted from [162]. Stippled circle indicates growth zone where additional mesenteries develop.