Family: Colorless body; two flagella, one directed anteriorly and the other usually posteriorly; stigma absent.
Genus: Generally ovoid; asymmetrical; plastic or rigid; a slit-like ventral furrow; flagella at anterior end; cytopharynx long; contractile vacuole anterior; nucleus posterior (Kudo, 1966). Lightly striated; trailing flagellum longer than anterior one (How to know the protozoa, 1979).

->> Description at WPRNO

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Cell body rigid
A. acinus 43 x 22 μm Japan, 1999	A. acinus 35-37 x 18 μm Japan, 199?	A. acinus ? 38 x 18 μm Mihashi Park Saitama city Saitama, 2005	A. acinus 35 x 19 μm Shiroyama Park Okegawa city Saitama, 2006
A. acinus 33 x 19 μm Daidarabotchi-ike Iizuna-kogen Nagano, 2003	A. acinus 33 x 16 μm Nidanuma Tsuchiyu-onsen Fukushima, 2005	A. acinus 33 x 16 μm Kashibaru marsh Karatsu Saga, 2008	A. acinus 33 x 14 μm Kannon-numa Shimogo Fukushima, 2008
A. acinus 31 x 16 μm near Yoshino park Mitsukaido Ibaraki, 2006	A. acinus 30 x 14 μm Japan, 1999	A. acinus a dividing cell Saitama, 1999	A. acinus 31 x 17 μm Shimo-muneoka Shiki Saitama, 2004
A. acinus 31 x 16 μm Onnenai Kushiro marsh Hokkaido, 2005	A. acinus 29 μm Ibaraki, 2000	A. acinus 28 x 12 μm Kejo-numa Furukawa Miyagi, 2003
A. acinus Japan, 1998	A. acinus Japan, 1998
Anisonema sp. 27 x 11 μm anterior rounded Nagaike park Hachioji Tokyo, 2005	Anisonema sp. 27 x 17 μm posterior rounded Japan, 1999	A. acinus small v. 25 x 11 μm Japan, 1998	A. acinus small v. 24 x 15 μm 18 x 11 μm Watarase Wetland Fujioka Tochigi, 2005
A. acinus small v. 24 x 11 μm Japan, 1998 Movies	A. acinus small v. 21 x μm Higusa-numa Hikari Chiba, 2003	Anisonema sp. 26 x 14 μm posterior rounded 1999	A. emarginatum ? 18 x 9 μm Japan, 199?
Cell body slightly plastic
Anisonema sp. 31 x 14 μm slightly plastic Japan, 199?	Anisonema sp. 26 x 14 μm slightly plastic Japan, 199?	Anisonema ?? or Retortamonas ? 20 x 8 μm tail flag. short	Anisonema sp. A. trepidum ? 23 x 11 μm slightly plastic Saitama, 2001
Cell body pointed at both ends
Anisonema sp.3 30 x 18 μm near Yamaguchi Univ. Yamaguchi, 2004	Anisonema sp.3 25 x 15 μm Okubo Ryoke Akigase park Saitama, 2005	Anisonema sp.3 14 x 9 μm both ends tapered Japan, 1999	Anisonema sp.3 12 x 8 μm both ends tapered Japan, 1999
Anisonema sp.3 12 x 8 μm both ends tapered Japan, 2000	Anisonema sp.3 12 x 8 μm both ends tapered Japan, 199?	Anisonema sp.3 cell 14 x 7.5 μm Otto-Numa Tsuchiura Ibaraki, 2002
??? , Anisonema or similar species
Anisonema sp. ? 11 x 5.5 μm Japan, 1999	Anisonema sp. ? μm Nishi-Urawa Saitama, 2003

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