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 Brébisson in Ralfs,
cell body 83 μm long, 47 μm wide, L/W=, isthmus 19 μm wide,
x 640, a wetland near Ichinose-enchi (along super forest road), Norikura highland, Azumi, Matsumoto city (formerly Azumi village), Nagano Pref., Japan, June 8, 2006 by Y. Tsukii
31 μm
63 μm
94 μm; x 640
Images of collecting locality:
a wetland near Ichinose-enchi (along super forest road), Norikura highland, Azumi, Matsumoto city (formerly Azumi village), Nagano Pref., Japan, June 8, 2006 by Y. Tsukii