Types of bacteria on the basis of flagella

Flagella:-

       Flagella are fine hair like structure present on motile form of bacteria . They are 12 to 30 nm in diameter and 3 to 12 um long. The flagella is composed of protein. There are also bacteria with out flagella called atrichous. On the basis of flagellation ,the rod shaped bacteria are classified into four groups by Leifson as

1)     Monotrichous bacteria having flagella at one end .   

2)     Diplotrichous bacteria having flagella at two ends of cell.

3)     Lophotrichous bacteria having many flagella at one end of bacteria.

4)     Peritrichous bacteria having flagella distributed allover the body.