Family:
Genus: Free-living; skeleton with or without coat; cuirass made of scales and of the basal part of the spicules; coat indistinguishable (Illustrated Guide, 1985). Siliceous scales arranged tangentially and radiating siliceous spines with pointed or bifurcated ends; (Kudo, 1966).

A. turfacea 5 clips μm Higashi-hiroshima Hiroshima, 1998	A. turfacea 2 clips Torinome kasen Nasu-shiobara Tochigi , 1999	A. turfacea 3 clips μm Vermont-Maine USA, 1999
Acanthocystis sp. 6 clips μm Higashi-hiroshima Hiroshima, 1998	Acanthocystis sp. 3 clips μm Higashi-hiroshima Hiroshima, 1998	Acanthocystis sp. 1 clips μm Higashi-hiroshima Hiroshima, 1998
Acanthocystis sp. 2 clips μm Higashi-hiroshima Hiroshima, 1998	Acanthocystis sp. 2 clips μm Higashi-hiroshima Hiroshima, 1998