Genus: Ovoid, firm; dorsal side convex, ventral side flattened; dorsal surface ridged;
adoral zone reduced or rudimentary; macronucleus U-shaped or in two rounded parts (Kudo, 1966).
No mariginal or caudal cirri; common genus (Carey, 1992).
Species:
Aspidisca turrita (Ehrenberg, 1831) Claparède & Lachmann, 1858,
cell body 40 μm long , x 200, x 400, sewage plant Oy, Bavaria, Germany, Nov. 2004 by Dirk Klos