Species: Cell body elliptical, 50-(56-60) μm long, 42-(48-56) μm wide, isthmus 13-(15-17) μm wide, L/W=1.3; semicells pyramid-shaped with flattened apex, basal corner broadly rounded, both sides convex with wavy margin (about 10-13 waves or granules), apex flat (waves/granules absent); cell wall covered with uniformely arranged granules interspersed by small pores, side view elliptical; chloroplasts with 2 pyrenoids in each semicell (Illustrations of The Japanese Fresh-water Algae, 1977).

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C. margaritiferum 66 x 55 μm L/W=1.2 Onnenai Kushiro marsh Hokkaido, 2005	C. margaritiferum 66 x 53 μm L/W=1.2 Oyomi marsh Hakuba Nagano, 2006	C. margaritiferum 60 x 50 μm L/W=1.1 Kejo-numa 1 Osaki Miyagi, 2006	C. margaritiferum 60 x 48 μm L/W=1.3 near Akai wetland Aizuwakamatsu Fukushima, 2005
C. margaritiferum 67-70 x 51-53 μm L/W=1.3 near Karakemi marsh Omachi Nagano, 2005	C. margaritiferum 69 x 55 μm L/W=1.3 Shiken-zaike Kamikawa Saitama, 2004	C. margaritiferum 68 x 55 μm L/W=1.2 Myoyo Fukiage Saitama, 2004	C. margaritiferum 67 x 59 μm L/W=1.2 Furuike marsh Togakushi highland Nagano, 2005
C. margaritiferum 65 x 58 μm L/W=1.3 Watarase Wetland Fujioka Tochigi, 2005	C. margaritiferum 64 x 50 μm 58 x 46 μm Kahan koen Kuroiso Tochigi, 2004	C. margaritiferum 63 x 50 μm Igashira park 3 Mooka Tochigi, 2008	C. margaritiferum 63 x 56 μm L/W=1.1 General Athletic p. Utsunomiya Tochigi, 2006
C. margaritiferum 62 x 50 μm L/W=1.2 Senuki Nasu Tochigi, 2004	C. margaritiferum 63 x 51 μm L/W= Ushiku-numa mp. Ryugasaki Ibaraki, 2008	C. margaritiferum 64 x 53 μm L/W=1.2 Norin Park Kawamoto Saitama, 2004	C. margaritiferum 61 x 50 μm L/W=1.2 Kodama town Saitama, 2003
C. margaritiferum two pyrenoids 62 x 48 μm L/W=1.3 Nishi-Urawa Saitama, 2003	C. margaritiferum 61 x 51 μm L/W=1.2 Konuma Sakado Saitama, 2004	C. margaritiferum 65 x 48 μm L/W=1.4 near carnivorous p. c. Sanmu Chiba, 2006
C. margaritiferum 54-63 x 44-50 μm L/W=1.2-1.3 near Takao-sakura p. Kitamoto Saitama, 2005	C. margaritiferum two pyrenoids 56 x 43 μm 59 x 43 μm 57 x 48 μm 54 x 45 μm Kurihashi Saitama, 2001	C. margaritiferum 59 x 51 μm L/W=1.2 Uruguay, 1999	C. margaritiferum 58 x 48 μm L/W=1.2 Watarase river Ashikaga Tochigi, 2004
C. margaritiferum 59 x 46 μm L/W=1.3 Aizu Recreation p. Aizuwakamatsu Fukushima, 2005	C. margaritiferum 57 x 50 μm L/W=1.1 near Seaside Botanical g. Himi Toyama, 2006
C. margaritiferum 55 x 45 μm L/W=1.2 Miyashiro Saitama, 2003	C. margaritiferum 55 x 47 μm L/W=1.2 Senganpi Suigo p. Saitama, 2005	C. margaritiferum 47-53 x 38-48 μm L/W= Umi-no-nakamichi Fukuoka, 2001	C. margaritiferum or C. vexatum ? 53 x 48 μm L/W=1.1 Yasuji-kawa Sawara Chiba, 2004
C. margaritiferum two pyrenoids 50 x 43 μm 50 x 45 μm L/W=1.1, 1.2 Saitama, 1999	C. margaritiferum stock Skg-1 42-51 x 34-45 two pyrenoids Koshigaya Saitama, 2001	C. margaritiferum ? 52 x 45 μm L/W=1.2 Tochigi, 1997	C. margaritiferum 50 x 42 μm 51 x 44 μm Senjo-ga-hara Nikko Tochigi, 2003
C. margaritiferum 50 x 44 μm L/W=1.1 Konpira bridge Shirakawa Fukushima, 2003	C. margaritiferum 50 x 41 μm L/W=1.1 water reservoir Yamaguchi Univ. Yamaguchi, 2004	C. margaritiferum 49 x 49 μm L/W=1.0 Tajima Fukushima, 2004	C. margaritiferum two pyrenoids 49 x 41 μm L/W=1.2 Shiraoka Saitama, 2003
C. margaritiferum ? 48 x 43 μm L/W=1.1 Koshigaya Saitama, 2001	C. margaritiferum μm Medaka-ike Nakatsugawa Gifu, 2008

Similar species -->> C. ochthodes (65-94 μm); C. intermedium; C. botrytis; C. vexatum; C. pachydermum;

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