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).

->> Description at WPRNO

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Spines with bifurcated ends
A. turfacea 38,44 μm Onnenai Kushiro marsh Hokkaido, 2005	A. turfacea 55-76 μm φ with Chlorella History and folk m. Tajima Fukushima, 2004	A. turfacea ? 36 μm φ with Chlorella ? Aizu Recreation p. Aizuwakamatsu Fukushima, 2005
A. turfacea μm φ near Omine Mt. Minakami Gunma, 2007	A. turfacea 70 μm φ near Omine Mt. Minakami Gunma, 2007	A. turfacea μm φ near OmiOmine-numa Minakami Gunma, 2008	A. turfacea Torinome kasen Nasu-shiobara Tochigi , 1999
A. turfacea 62 μm φ with Chlorella Numa-no-hara m. Madarao highland Niigata, 2005	A. turfacea 78 μm φ with Chlorella Karakemi marsh Omachi Nagano, 2006	A. turfacea 57 μm φ with Chlorella Nozomiko 2 Iiyama Nagano, 2007	A. turfacea 53, 64 μm φ with Chlorella Oyomi marsh Hakuba Nagano, 2006
A. turfacea 52 μm φ Furuike marsh Togakushi highland Nagano, 2005	Acanthocystis sp. 53 μm φ Dojo-ike Norikura highland Nagano, 2006	A. turfacea 43,53,70,72,89 μm φ with Chlorella Imou bog Toyohashi Aichi, 2004	A. turfacea ? 50 μm φ Kashibaru m.5 Karatsu Saga, 2006
A. turfacea Higashi-hiroshima Hiroshima, 1998	Acanthocystis sp. 30,35 μm φ Numa-no-hara m. Madarao highland Niigata, 2005
A. turfacea or A. nichollsi ? 62 μm φ with Chlorella Sakitama-kofun p. Gyoda Saitama, 2004	A. turfacea ? or A. nichollsi ? 35,41,44 μm φ with Chlorella Higashi-sano Hakuba Nagano, 2004	A. turfacea 40,42 μm φ or A. nichollsi ? with Chlorella ? Numa-no-hara m. Madarao highland Niigata, 2005	Acanthocystis sp. Higashi-hiroshima Hiroshima, 1998
A. turfacea with Chlorella Japan, 199?	A. turfacea or A. pectinata ? with Chlorella Senjo-ga-hara Nikko Tochigi, 2003	A. turfacea ? with Chlorella USA, 1999 Movies	A. turfacea ? μm Japan, 1998
Spines with ??? ends
A. penardi ? μm Omine-numa Tsukiyono Gunma, 2003	A. penardi ? μm Igashira park Mooka Tochigi, 2008	A. penardi ? with Chlorella Azami-ike 4 Norikura highland Nagano, 2007	A. penardi ? Tane-ike Togakushi highland Nagano, 2006
A. penardi ? Iyari marsh Omachi Nagano, 2006	A. penardi ? Iyari marsh 1 Omachi Nagano, 2008	A. penardi ? Kannon-numa Shimogo Fukushima, 2008	A. penardi ? Kannon-numa Shimogo Fukushima, 2008
A. penardi ? Kashibaru m. Karatsu Saga, 2008
A. pectinata ? cell μm Hagoromo Park Chiba, 2003	Acanthocystis Kareki-numa m. Nikko Tochigi, 2008
Acanthocystis sp. with Chlorella ? Senjo-ga-hara Nikko Tochigi, 2003	Acanthocystis sp. μm Saitama, 1999	Acanthocystis sp. with Chlorella μm Kurihashi Saitama, 2001	Acanthocystis sp. μm Higashi-Matsuyama Saitama, 2002
Acanthocystis sp. 30 μm Shirahata-Numa Urawa Saitama, 2005	Acanthocystis sp. body 40 μm Numa-no-hara m. Madarao highland Niigata, 2005	Acanthocystis sp. Miyatoko marsh Minami-Aizu Fukushima, 2008	Acanthocystis sp. μm Japan, 1998

Similar genus -->> Choanocystis;

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