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[Emergence process of Philophthalmus rhionica (Trematoda) miracidia].

The hatching process of miracidia of Ph. rhionica is described. Mature eggs are contained in the uterus of the fluke. Hatching of the eggs and liberation of the miracidia take place in the water immediately after the eggs have left the flukes. After hatching the size of larvae increases and they begin to swim actively. The main reason blocking the hatching is the high osmotic pressure in the uterus of the fluke which is created by some substances secreted in the secretory cells. The same cells are found only in the uterus of "viviparous" trematodes.