Family: Trichome (filamentous structure) with heterocysts; with equal diameter throughout hole length; no branching; heterocysts intervening or at base.
Genus: Heterocysts present at terminal; adjascent cells never form a large akinete (Illustrations of The Japanese Fresh-water Algae, 1977).

Anabaenopsis sp. μm Tsuchiura Ibaraki, 2003	Anabaenopsis sp. 4-6 x 4.5 μm Senuki Nasu Tochigi, 2004	A. raciborskii ? μm Daidarabotchi-ike Iizuna-kogen Nagano, 2003	A. raciborskii ? 4.5-8 x 4 μm Koigakubo marsh Tessei-cho Okayama, 2004
Anabaenopsis sp. μm Daidarabotchi-ike Iizuna-kogen Nagano, 2003	Anabaenopsis sp. 3-6 x 4 μm Kurome river Asaka Saitama, 2004	Anabaenopsis sp. 2-4 x 4.5 μm Kuritsubo Hidaka Saitama, 2004	Anabaenopsis sp. 2-4.5 x 4.5 μm Kuritsubo Hidaka Saitama, 2004
Anabaenopsis sp. 3.5-7 x 3.5 μm Komado marsh Showa and Tajima Fukushima, 2004	Anabaenopsis sp. 4.5-9 x 4.5 μm Higashi-sano Hakuba Nagano, 2004	Anabaenopsis sp. 3-3.5 x 4 μm Riverside green l. Sawara Chiba, 2004	Anabaenopsis or Oscillatoria ? 4-8 x 5.5 μm Ushidome-ike Norikura highland Nagano, 2005

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