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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Ref ID : 648

H. Schmoller, L. Jonas, and J. Ludvik; [Electron microscopical studies on encystment of Vahlkampfia trilaminata n. sp.]. Arch.Protistenk 126:427-444, 1982

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No pecularities could be revealed in the trophozoite, but of the investigated ultrastructural changes during encystment the following seem to be valuable for species characterization a) the early appearance of a single and very electron-dense granule inside the nucleolus in excentric position, b) the respectively loose fibrilar or dense fibrilar structure of the two layers of the cyst wall, their close apposition one to the other, and the close apposition of the inner one to the cell membrane, c) the intracellular appearance of an electron-dense aggregation immediately beneath the cell membrane. The presence of this aggregation together with the two extracellular layers led to the choice of the species designation "trilaminata".