Using other methods of classifications other than taxonomy, classify the flagellates?

Flagellates can also be classified based on their habitat, mode of nutrition, and presence of certain organelles.

1. Based on habitat:
- Free-living flagellates: These flagellates live independently in various aquatic environments such as freshwater, marine, and soil.
- Parasitic flagellates: These flagellates live inside the bodies of other organisms and obtain nutrients from their host.

2. Based on mode of nutrition:
- Autotrophic flagellates: These flagellates are capable of producing their own food through photosynthesis.
- Heterotrophic flagellates: These flagellates obtain nutrients by consuming organic matter or other organisms.

3. Based on presence of certain organelles:
- Mixotrophic flagellates: These flagellates are capable of both photosynthesis and heterotrophic feeding.
- Flagellates with secondary plastids: These flagellates have acquired plastids through secondary endosymbiosis with another eukaryotic organism.

Using other methods of classification of medically important flagellates other than taxonomical classification