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. 2012 Sep 14;9:23. doi: 10.1186/1742-9994-9-23

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Copyright ©2012 Baeumler 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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Stages of metanephridial system development in Lepidochitona corrugata (surface renderings). A, D, G. Posterior part of the body from dorsal (external surface transparent). B, C, E, F, H. Details of developing metanephridial systems enlarged. A–C. spm 3a. D–F. spm 4. G–H. spm 5. C, F, H. External surface transparent with internal lumen visible. ahp, anlage of heart and pericardium; ak, anlage of the kidney; arp, anlage of the renopericardial duct; ed, efferent nephroduct; ia, initial anlage of metanephridial and central blood vessel system; lap, lumen of the anlage of pericardium and heart; lia, lumen of the initial anlage; lnd, left nephridial differentiation; rnd, right nephridial differentiation.