Summary
In the cytoplasm of the marine ciliateEuplotes vannus, there exist two conspicuous types of membrane bound inclusions: 1. irregularly shaped crystals which are highly anisotropic; 2. globular lithosomes characterized by concentrically arranged layers of deposits which exhibit only faint birefringence. Normally, both structures form distinct accumulations. Energy dispersive X-ray microanalysis of these accumulations reveals a high content of calcium and phosphorus, besides magnesium, sulphur and chlorine. Analysis of cell areas devoid of the inclusions show significantly lower calcium- and phosphorus-peaks.
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Hausmann, K., Walz, B. Feinstrukturelle und mikroanalytische Untersuchungen an den Kristallen und Lithosomen des CiliatenEuplotes vannus . Protoplasma 99, 67–77 (1979). https://doi.org/10.1007/BF01274070
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DOI: https://doi.org/10.1007/BF01274070