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Abstract
In the cytoplasmic vacuoles and lacunas of the monothalamous foraminifera Myxotheca arenilega and Allogromia laticollaris unicellular organisms of about 2,5-6 µm appear, which persist intracellularly, showing no disintegration, even after a long starvation period of the host. The mono- or multinucleated cells show a well developed dense endoplasmic reticulum, a large number of ribosomes, elongated mitochondria of the tubulus type, a few Golgi - complexes and paired centrioles or basal bodies. The cells are surrounded by a sheath of about 0.1 μm, consisting of numerous lamellae in a loose arrangement together with osmiophilic substances. It is presumed that this protects the cells against digestion by the host. Since foraminifera which contain these organisms show no differences in growth and size at the end of their developing period compared to those cells which are free from these organisms, it is doubted that these organisms are parasites. They are also presumably not symbiontic organisms, since they possess no thylacoids. It is likely that they are harmless commensals. Their systematic position is unknown.
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