[Pleistophora ladogensis sp. n., a microsporidian (Protozoa, Microsporidia) from the musculature of the burbot, Lota lota, and of the smelt, Osmerus eperlanus eperlanus ladogensis].
The parasite develops inside the fibres of the cross-striated musculature. On the histologic sections of the affected tissue most young stages of P. ladogensis are represented by 2--6 nucleic cells 5--6 mu in size. Mature pansporoblasts have a thick and solid membrane. Their average size is 43 (18--60) mu. The number of spores in pansporoblasts is over 16. Live spores are egg-shaped and are 5.4 (5.0--5.8).2.9 (2.7--3.3) mu in size. The length of the polar filament is 100 to 180 mu.
D000818:Animals; D016782:Apicomplexa / Q000145:classification* / Q000469:parasitology; D005399:Fishes / Q000469:parasitology*; D009132:Muscles / Q000469:parasitology*; D012426:Russia; D013170:Spores