(b) : On the basis of locomotory organelles the protozoan protists are divided into four groups Mastigophora, Sarcodina, Sporozoa and Ciliata. Trypanosoma belongs to class zooflagellata which comes under the group mastigophora. The characteristics are : (i) These zooflagellates are generally uninucleate, occasionally multinucleate. (ii) The body is covered by a firm pellicle. (iii) Nutrition is holozoic, parasitic and saprobic. (iv) Reserve food is glycogen.