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How do you classify protozoans?


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Solution

Protozoans:

  1. Protozoa are single-celled organisms and come in many different shapes and sizes ranging from an Amoeba which can change shape to a Paramecium with its fixed shape and complex structure.
  2. They are found in a wide variety of moist habitats that including freshwater, marine environments, and soil.

Subphylum:

  1. The Protozoa are regarded as a subkingdom of the kingdom Protista, despite being classified in the kingdom Animalia in the traditional system.
  2. Subkingdom Protozoa is divided into seven phyla of which the important four are: Mastigophora, Apicomplexa, Sarcodina, and Ciliophora.
  3. Mastigophorans are flagellated protozoans: they move with the help of flagella. Eg, Giardia lamblia
  4. Apicomplexa are sporrans: they lack any organ of motility.
  5. Sarcodina or amoebae: they locomote with the help of pseudopodia. Eg, Entamoeba histolytica.
  6. Ciliophora are ciliates: they have cilia for movement and feeding. Eg, Balantidium coli

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