Species:
Cell body 58-(64.5-95)-100 μm long, (42-56)-62 μm wide,
isthmus (14-19)-20 μm wide, L/W=1.5; semicells pyramidal in shape, with
flattened apex, basal corner rounded, side and apical view elliptical; cell wall dotted
(Illustrations of The Japanese Fresh-water Algae, 1977).
Similar species -- >>C. pseudopyramidatum;
Cosmarium pyramidatum or C. pseudopyramidatum,
cell body 72 μm long, 43 μm wide, L/W=1.7, isthmus 20 μm wide,
x 640, No.6, Omine-numa (pond/marsh), Omine, Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, April 15, 2007 by Y. Tsukii
31 μm
63 μm
94 μm; x 640
Images of collecting locality:
No.6, Omine-numa (pond/marsh), Omine, Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, April 15, 2007 by Y. Tsukii