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. 2008 Nov 11;2(11):e334. doi: 10.1371/journal.pntd.0000334

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Jones et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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A. Low magnification image showing miracidium within the expanded lacuna. The penetration glands are evident in the miracidium. B. Expanded lacuna with numerous membranes (arrows). C. Outer envelope. Note that the external fibrils appear to be unravelling. Partly degraded rosettes are shown (arrows). D. Lacuna, showing membrane body, presumably a vacuole. Cil- cilia; Gl Nu- nuclei of penetration glands; Mir- miracidium; OE- outer envelope.