Eudorina colonies
are composed of 16 or 32 spherical, biflagellate cells loosely aggregated into
a globular shape within a mucilage envelope.
In
some species the mucilage sheaths extend
around each individual cell. The cells
are spherical or ovoid and each have two
equal flagella with contractile vacuoles at the base, an eyespot,
and a large cup- shaped chloroplast with at least one pyrenoid.
The eyespots of the anterior cells are larger
than those of the posterior cells.
In culture, the cells
may be solitary (above) or may
form irregular clumps
(right) or small colonies (below).
