Organisation: Epiphanes senta. Lebensweise freischwimmend: Brachionus, Filinia, Asplanchna, Conochilus; kriechend: Squatinella, Adineta, Philodina (Anabiose); sessil: Floscularia, Collotheca; wirtsgebunden: Seison annulatus, Rotifer roeperi, Hertwigella volvocicola.

First, some morphological aspects of Epiphanes senta are shown as an introduction to the organization of rotifers. The different adaptions to life in the open-water zone of ponds and lakes are demonstrated by representatives of the genus Brachionus, Filinia, Asplanchna and Conochilus. Then some creeping forms are shown: Squatinella, Adineta, Philodina. The latter, too, serves as an example for the ability to survive in a desiccated form (anabiosis), which is an adaption of some rotifers to extreme habitats. After this a species of Floscularia and Collotheca are demonstrated as examples of different modes of sessile life. Finally some host-dependent forms (Seison annulatus, Rotifer roeperi, Hertwigella volvocicola) are shown.