Order: Cell body covered with theca; cingulum (horizontal groove) and sulcus (vertical groove) consipicuous.
Family: Apical pore present (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Body round to polygonal; cingulum median, deep; thecal plates 5-6 in cingulum; some with apical and antapical horn (Illustrated Guide, 1985). Epicone (or epitheca) consists of 11-14 thecal plates; hypocone (or hypotheca) of 7-8 thecal plates (Illustrations of The Japanese Fresh-water Algae, 1977).

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P. bipes 10 samples 50-68 μm 199?-2008	P. bipes 10 samples 50-68 μm 199?-2008	Peridinium sp. 52-66 x 50-58 μm Lake Kawaguchi Yamanashi, 2001	P. elpatiewskyi ? 2 samples 27-35 μm 199?-2001
P. volzii ? 6 samples 47-55 μm 1998-2005	Peridinium sp. μm Daidarabotchi-ike Iizuna-kogen Nagano, 2003	P. cunningtonii ? 32 x 24 μm Koshigaya Saitama, 2001
P. pygmaeum ? 33 x 28 μm Tama river Komae Tokyo, 2004	P. pygmaeum ? 35 x 32 μm Lake Nojiri Shinano Nagano, 2004
Peridinium sp. ? 31 x 32 μm Shikinawa-ike Fukuoka, 2001	Peridinium sp. ? μm City Museum Iruma Saitama, 2003	Peridinium sp. ? μm Chichibu Muse p. Saitama, 2003	Peridinium sp. ? 17-20 x 12-17 μm Tanohara Natural p. Ontake highland Nagano, 2005
Peridinium sp. ? 22 x 15 μm Ukishima marsh Tsugaike highland Nagano, 2005	Peridinium sp. ? μm Daidarabotchi-ike Iizuna-kogen Nagano, 2003	Peridinium sp. P. volzii ? 43 x 45 μm Shimo-no-koike Shiga highland Nagano, 2004

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