- Photographic documentations of aquatic protozoa (Ciliophora, Gragarinida)
- Rotifers (Rotatoria) – Coll. Hauer, Coll. Koste
- Regional collections (Hesse, Danube River and its tributaries, North Scandinavia) of several invertebrate macrozoa-groups (excluding insects); one focal point
- of the collections are neozoa taxa of Central European rivers
