| Rimostrombidium lacustris, lateral view; optical median section, focal plane on the macronucleus (arrowhead) (1) |
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| Rimostrombidium lacustris; apical view, focal plane on the ciliary wreath and the sausage-like macronucleus (arrowheads) (1) |
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| Rimostrombidium lacustris, another specimen; apical view; focal plane on the metachronous waves of the ciliary wreath. (2) |
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| Rimostrombidium lacustris, another perspective of the same specimen shows that the specimen is dividing. Focal plane on the oral part of the daughter. (2) |
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| Rimostrombidium lacustris, apical view on ther ciliary wreaths of mother (right) and daughter (left). The ring-like structure is a diatom (Centrales) (2) |
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| Rimostrombidium lacustris, lateral view; focal plane on the oral region of the daughter (arrowheads). (2) |
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