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. 2011 Apr 18;6(4):e18799. doi: 10.1371/journal.pone.0018799

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Holtfreter 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) Viable mature eggs containing dark coloured and fully developed miracidia (←). (B) Dead eggs without any content (→) and a mature egg containing a dark coloured miracidium (←). (C) Dead egg (→) with surrounding granulomatous tissue (↑). (D) Viable immature eggs of developmental stage 1 (↓) containing various vitelline cells.