Flagellates and swimming colonies
Phacus
Phacus (leaf euglenid)
A flat, rigid, leaf-shaped green euglenid with a tail spine. It twists as it swims, flashing edge-on.
What to look for
- Flat leaf or teardrop shape, often twisted, with a pointed tail.
- Rigid: does not change shape like Euglena.
- Red eyespot and one flagellum at the front.
Size in the field
Small; 400× needed for detail.
Where to find it
Nutrient-rich ponds and ditches, often together with Euglena.
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