The
Actinosphaerium is a protist (protozoan) and belongs to the Phyllum
Sarcodina. It
looks like a sea urchin and is from 200-1000 micrometers wide. This
is quite large for a protists. The
image below (left) shows a close up of the endoplasm and ectoplasm, the water
expelling vesicles (WEV) and how this protists uses the radial arms to
move by flowing the protoplasm into the arms. These
are also called Heliozoans, or "Sun Animals". The body is
spherical with stiff unbranched arms radiating in all directions. 
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