Genus: Body round to polygonal; cingulum median, deep; thecal plates 5-6 in cingulum;
some with apical and antapical horn (Illustrated Guide, 1985).
Epicone (or epitheca) consists of 11-14 thecal plates; hypocone (or hypotheca) of
7-8 thecal plates
(Illustrations of The Japanese Fresh-water Algae, 1977).
Species: |
31 μm
63 μm
94 μm; x 640
Peridinium sp. ?,
cell body μm long, μm wide, L/W=,
x 640, No. 5, Omine-numa (pond/marsh), Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, October 12, 2008 by Y. Tsukii
31 μm
63 μm
94 μm; x 640
