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Ceratium<br />
cells armoured, with a sculptured cellulose<br />
wall often consisting of several plates,<br />
perforated with pores, and with deep<br />
transverse and longitudinal grooves<br />
large (>100 microns) with lobe like<br />
extensions “horns”<br />
> 100 microns long<br />
In the plankton of lakes and ponds