Genus: Solitary or colonial; individuals with vase-like, hyaline, but sometimes, yellowish cellulose lorica, drawn out at its base; one to two lateral chromatophores (chloroplasts); usually with a stigma; in colonial forms daughter individuals remains attached to the inner margin of aperture of parent loricas and there secrete new loricas; (Kudo, 1966).
Species: Colonies planktonic, brached; lorica base-like, with wide opening; lateral margins of lorica smooth, slightly swelled; 24-45 μm long, 8-14 μm wide (Photomicrographs of the Freshwater Algae, vol. 2, 1984). Lorica 30-45 μm long, 10-15 μm wide, opening 10-15 &956;m wide (Illustrations of The Japanese Fresh-water Algae, 1977).

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D. sertularia lorica μm Ryugahara m. Yuri-Honjo Akita, 2008	D. sertularia cell μm lorica 30 x 9 μm Hachiman-numa m. Hachimantai Iwate, 2005	D. sertularia cell 16 x 6 μm lorica 40 x 7-10 μm Sensho-ga-hara 7 Shizukuishi Iwate, 2007	D. sertularia cell 16 x 6 μm lorica 40 x 8 μm Mida-ga-hara Gassan Yamagata, 2005
D. sertularia cell 17 x 8 μm lorica 27 x 9 μm Kurobane Tochigi, 2001	D. sertularia lorica μm Numappara marsh Kuroiso Tochigi, 2003	D. sertularia lorica μm Senjo-ga-hara Nikko Tochigi, 2003	D. sertularia lorica 25 μm Ashikaga flower p. Ashikaga Tochigi, 2006
D. sertularia cell μm lorica μm Watarase Wetland Fujioka Tochigi, 2005	D. sertularia cell 13-14 x 6.5 μm lorica 35 x 9 μm Yumi-ike Shirane mountain Gunma, 2005	D. sertularia cell 20 x 6 μm lorica 32 x 8 μm Tsutsuji-ga-oka Tatebayashi Gunma, 2006	D. sertularia cell μm lorica μm Ayamedaira 4 Katashina Gunma, 2007
D. sertularia cell 18 x 7.5 μm lorica 28 x 10 μm Mihashi Park Saitama, 2002	D. sertularia cell μm lorica μm Hanyu Saitama, 2003	D. sertularia cell 17 x 7 μm lorica 23 x 8.5 μm Omiya Saitama, 2001	D. sertularia cell 15.5 x 6 μm lorica 23 x 9 μm Nishi-Urawa Saitama, 2001
D. sertularia cell 13 x 8 μm lorica 28 x 9 μm Jizoh-bori Sannoh Park Saitama, 2004	D. sertularia cell 15 x 6 μm lorica 30 x 9 μm Kawaguchi Natural p. Kawaguchi Saitama, 2005	D. sertularia cell 13 x 9 μm lorica 27 x 10 μm Okubo Ryoke Akigase park Saitama, 2005	D. sertularia or D. divergens ? cell μm lorica μm Nishi-Urawa Saitama, 2003
D. sertularia cell 17 x 8 μm lorica 30 x 9 μm Akasaka-numa Iwatsuki-ku Saitama, 2006	D. sertularia cell 15 x 6.5 μm lorica 32 x 8 μm Minuma Natural p. Midori-ku Saitama, 2006	D. sertularia cell μm lorica μm Tonbo-no-numa Isumi Chiba, 2007
D. sertularia cell 22 x 6.5 μm lorica 35 x9 μm Toneri Park Tokyo, 2001	D. sertularia ? cell μm lorica μm Japan, 199?
D. sertularia lorica 30-37 μm Shimo-no-koike Shiga highland Nagano, 2004	D. sertularia lorica 36 μm Tanohara marsh Shiga highland Nagano, 2006	D. sertularia cell 12-16 x 7 μm lorica 33-40 x 9 μm Nagaike Shiga highland Nagano, 2005	D. sertularia cell 15-18 x 6-7 μm lorica 30-37 x 8-9 μm Shibu-ike Shiga highland Nagano, 2005
D. sertularia lorica 30 μm Hyoutan-ike Shiga highland Nagano, 2007	D. sertularia lorica 36 μm Karakemi marsh Omachi Nagano, 2006	D. sertularia cell 13 x 7 μm lorica 38 x 9 μm Kowashimizu Suwa Nagano, 2005	D. sertularia cell 17 x 6 μm lorica 33 x 9 μm Tanohara Natural p. Ontake highland Nagano, 2005
D. sertularia ? cell 12-16 x 7-8 μm lo. 28-35 x 10 μm Watasuge marsh Tsugaike highland Nagano, 2005	D. sertularia cell 15-20 x 6-7 μm lorica 30-40 x 10 μm Ukishima marsh Tsugaike highland Nagano, 2005
D. sertularia lorica 25 μm Kodanuki marsh Fujinomiya Shizuoka, 2006	D. sertularia cell μm lorica 30-35 x 9-10 μm water reservoir near Yamaguchi Univ. Yamaguchi, 2004	D. sertularia cell 18 x 6.5 μm lorica 28 x 10 μm Sue-machi Fukuoka, 2001

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