Genus: Colonies of 4-32 cells; cell body long crescent or spindle in shape, tapered at both ends; cells attached with each other at the center of the body, paralleled or radially arranged; no gelatinous sheath; a chloroplast; no pyrenoids; planktonic (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Species:

A. densus 56 x 3.5 μm Mizumoto p. Tokyo, 2001	A. densus 43 x 3 μm Dewa Park Saitama, 2001	A. densus 39 x 2 μm Showa Memorial p. Tokyo, 2001	A. densus stock Tts-11, Tts-10 Showa Memorial p. Tokyo, 2001
A. densus μm Numappara marsh Kuroiso Tochigi, 2003	A. densus μm Numappara marsh Nasu-shiobara Tochigi, 2007	A. densus 45 x 2.5 μm near Yamaguchi Univ. Yamaguchi, 2004	A. densus 50 x 3 μm Shirahata-Numa Urawa Saitama, 2005
A. densus 55 x 2 μm Sansaku-ike Mizumoto Park Tokyo, 2006

Similar Genus ->> Monoraphidium; Selenastrum;

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