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).

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A. aculeata 56 x 50 μm with dorsal thorn Japan, 199?	A. aculeata 50 x μm with dorsal thorn Japan, 1997	A. aculeata 35 x 30 μm with dorsal thorn Uruguay, 1999	A. aculeata 40 x ? μm with dorsal thorn Kagami-ishi Fukushima, 2001
A. steini 36-45 x 30-36 no thorn Japan, 199?	A. steini 35 x 34 μm no thorn Saitama, 1999	A. steini 32 x 25 μm no thorn Saitama, 1999	A. turrita by Dirk Klos 40 μm Bavaria Germany, 2004
A. cicada (=A. costata) 30 x 24 μm dorsal ridges Uruguay, 1999	A. cicada (=A. costata) 23 x 9μm dorsal ridges Japan, 1998	A. cicada (=A. costata) 27 x 21 μm dorsal ridges Japan, 1999	A. cicada 28 x 23 μm Tama river Chofu Tokyo, 2004
A. cicada ? 30-40 μm dorsal ridges Japan, 1998	Aspidisca sp. 30 x 24 μm 6 transverse cirri Saitama, 1999	Aspidisca sp. 35 x 25-27 μm no ridges Japan, 1998, 99	Aspidisca sp. 22 x 20 μm no ridges Japan, 2001
Aspidisca sp. 31 x μm Kuroiso Tochigi, 2002	Aspidisca sp. x μm Tama river Setagaya Tokyo, 2004

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