Genus: Cell body small, length = width, strong constriction at its center; semicells inverted triangular, ellipsoidal, rectangular, etc. in shape; straight or slightly curved spiny projections at each corner; one pyrenoid in each semicell; cell wall smooth (Illustrations of The Japanese Fresh-water Algae, 1977).
Species:

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A. octocornis 21 x 17 μm Iroha-numa Zao mountain Yamagata, 2005	A. octocornis μm Kannon-numa Shimogo Fukushima, 2008	A. octocornis μm Omine-numa 5 Minakami Gunma, 2007	A. octocornis 31 x 24 μm 29 x 26 μm Kumakubo Nasu-shiobara Tochigi, 2005
A. octocornis μm Kareki-numa m. Nikko Tochigi, 2008.9	A. octocornis 35 x 35 μm Kashibaru marsh Karatsu Saga, 2006

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