volume 76, issue 5, P725 1990
DOI: 10.2307/3282989
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Abstract: Miracidia of the eyeflukes Philophthalmus megalurus and Philophthalmus gralli contain a preformed larval stage that was identified as a redia by electron microscopy and, on living forms, by the presence of ambulatory buds and an oral opening. This redial stage escaped and actively moved about when the miracidium stopped swimming in pond water. No redial escape was observed in NaCl solutions even though miracidia became immobile, but escape was noted in Hanks' balanced salt solution (HBSS) after 7 hr of exposur…

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