The rotifer usually enters the developing gametophore where it induces gall formation; here it feeds on the cytoplasm and the cytoplasmic organelles. Egg deposition is within the galls. Young animals leave the gall; copulation is outside the host, with resting eggs produced overwintering in the sediments. It is unknown if gall formation is only caused by P. werneckii. On several occasions resting eggs omamented with spines, instead of the smooth ones ofP. werneckii, have been observed in Vaucheria. This could point towards another species or the existence of pseudosexual eggs.
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