Family:
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).

Aspidisca sp. 4 clips Tokyo, 1998	Aspidisca sp. 3 clips Tokyo, 1998	Aspidisca sp. 4 clips Tokyo, 1998	Aspidisca sp. 4 clips Tokyo, 1998
Aspidisca sp. 5 clips Torinome-Kasen p. Nasu-shiobara Tochigi, 1998	Aspidisca sp. 3 clips Higashi-hiroshima Hiroshima, 1998	Aspidisca sp. 3 clips Kurome river Asaka Saitama, 1999