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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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Selected horizontal magnetic resonance imaging sections of different sea urchin species taken from Additional files 3, 4, 5, 6. (A) Eucidaris metularia. Resolution: (81 μm)³. Aristotle's lantern, gonads, Stewart's organs, and stomach can be seen. (B) Psammechinus miliaris. Resolution: (44 μm)³. Aristotle's lantern, lantern muscles, stomach, and ampullae are visible. (C) Echinoneus cyclostomus. Resolution: (86 μm)³. Digestive tract with oesophagus, gastric caecum, stomach, and rectum are shown. (D) Echinocyamus pusillus. Resolution: 20 × 18 × 18 μm³. Aristotle's lantern, gonads, stomach, and rectum are represented. Scale bar: (A)-(C) 0.5 cm; (D): 1 mm. al, Aristotle's lantern; am, ampulla; es, oesophagus; gc, gastric caecum; lm, lantern muscle; re, rectum; so, Stewarts' organ; st, stomach.