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: (Illustrations of The Japanese Fresh-water Algae, 1977).

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var. extensus:
A. extensus ? v. extensus 15 x 15 μm Yahei-daira m. Yonezawa Yamagata, 2007	A. extensus v. extensus μm Kannon-numa Shimogo Fukushima, 2008	A. extensus ? v. extensus μm Fujimitashiro Katashina Gunma, 2007	A. extensus v. extensus 15 x 27 μm Okubo Ryoke Akigase park Saitama, 2005
A. extensus 18 x 23 μm Tanohara marsh Shiga highland Nagano, 2004	A. extensus v. extensus 18 x 29 μm Nozomiko Iiyama Nagano, 2007	A. extensus v. extensus 18 x 31 μm Tanohara marsh 1 Shiga highland Nagano, 2007	A. extensus v. extensus 17 x 17 μm Tanohara Natural p. Ontake highland Nagano, 2005
A. extensus v. extensus μm Chigo-ike m.3 Shiga highland Nagano, 2008	A. extensus v. extensus 16.5 x 15 μm Kodanuki marsh Fujinomiya Shizuoka, 2006
var. elongatus:
A. extensus v. elongatus 17 x 13 μm Tane-ike Togakushi highland Nagano, 2005	A. extensus v. elongatus 26 x 24 μm Shimo-no-koike Shiga highland Nagano, 2004	A. extensus v. elongatus 19 x 17 μm Karakemi marsh Omachi Nagano, 2006	A. extensus v. elongatus μm Water reservoir Iiyama Nagano, 2008

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