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The microsporidium Nosema pontogammari Ovcharenko and Kurandina, 1987 was detected in the muscles of Pontogammarus robustoides collected in the stream of South Baltic Coastal Zone (sample site N 54°16', E 19°25') The parasite infects the cytoplasm of the muscle cells. The presence of remarkable intracytoplasmic vacuoles was noted inside of some parasite cells. Transmission electron microscopy showed...