Ref ID : 7687
Gertrud Benwitz; [Entwicklung der Haptocysten von Ephelota (Suctoria, Ciliata)]. Protistologica XVIII(4):459-472, 1982
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The haptocysts of the suctorian tentacle enter in action during the capturing of the prey. The development of these organelles was still unknown. In Ephelota it is realized within cup-shaped vesicles probably originating from the endoplasmic reticulum. While in all protists so far examined by the electron microscope, a single extrusome develops in each vesicle, one "haptocyst forming vesicle" produces about 20-30 of these organelles. The final haptocyst localized on the tentacle is surrounded by a unit membrane. This membrane is distinct from that of the vesicle and is synthesized inside the latter. All haptocysts of a "forming vesicle" develop synchronously. They appear to be released into the cytoplasm as groups and not one after the other. The fact that a considerable residual vesicle occurs suggests the detachmentment of haptocysts by membranous pinching. In the cysts of Ephelota plana fields of highly regular arranged haptocysts occur in the endoplasm, as already described in other Suctoria. This phenomenon can be interpreted diversily but it appears in this resting stage without relation to a genesis of haptocysts. It rather might be a pool of these organelles.