Euglenoids have tiny, red eye-spots to help them swim into the light. Most have green chlorophyll and make their own food. They live in ponds where the water is rich in organic matter. They help give the water a greenish colour. They reproduce by splitting lengthwise.
Some euglenoids are pear-shaped and called 'phacus'.
To add to the confusion, some euglenoids have no chlorophyll and hunt other microbes for their food. These euglenoids are usually considered animals instead of plants. They are about 0.03 mm long. Dinoflagellates that live in ponds usually have a brown, spiny shell covering their soft insides. The shell is made of lime.