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Gamophyceae: Zygnematales: Desmidiaceae

Sphaerozosma excavatum
-->> Teilingia excavata (Ralfs) Bourrelly

Sphaerozosma excavatum Genus: Cell body flat, constricted at the center; semicells with two small projections at their apexes; cells connected with each other by the projections.
Species: Filaments not twisted; cells loosely connected to be separated; cell body 8.4-11 μm long, 7-10.8 μm wide, constriction 4-6 μm wide; semicells broad hexagonal in shape, apex slightly depressed, with two short projections to connect with adjacent cells (Illustrations of The Japanese Fresh-water Algae, 1977).
Similar genus -->> Onychonema;

Sphaerozosma excavatum Ralfs, cell body 9-10 μm long, 9-10 μm wide, L/W=, isthmus 4 μm wide, x 640, Ko-numa (pond/marsh), Tsukiyono town, Gunma Pref., Japan, April 15, 2007 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Sphaerozosma excavatum Sphaerozosma excavatum

Images of collecting locality: Ko-numa (pond/marsh), Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, April 15, 2007 by Y. Tsukii

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