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. 2008 Jul 23;6:33. doi: 10.1186/1741-7007-6-33

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Copyright © 2008 Ziegler 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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3D reconstructions of the gastric caecum of selected irregular sea urchin species. The gastric caecum is a translucent body free of sediment and probably constitutes one of the main sites of digestion [38,39]. The upper diagrams show an aboral view, the lower diagrams a lateral view with the anterior side (ambulacrum III) oriented towards the right-hand side. Arrows indicate the position of the junction of the gastric caecum with the stomach. (A) Echinoneus cyclostomus, Echinoneoida. (B) Echinolampas depressa, Cassiduloida. Species of this sea urchin taxon presumably all possess a highly reduced gastric caecum consisting of numerous small blindly ending sacs. (C) Pourtalesia wandeli, Holasteroida. (D) Abatus cavernosus, Spatangoida. Scale bar: 0.5 cm.