*TYPES OF BACTERIA🦠* *1. On the basis of their shape :-* *(i) Coccus (pl: Cocci) –* Spherical shaped, e.g.,  Streptococcus lactis *(ii) Bacillus (pl: Bacilli) –* Rod shaped, e.g., E. coli,  Lactobacillus *(iii) Spirillum (pl: Spirilla) –* Spiral shaped bacteria, e.g.,  Spirillum volutans, Spirochete. *(iv) Vibrium (pl: vibrium) –* Comma shaped, e.g., Vibrio cholerae *(v) Pleomorphic bacteria –* Variable in shape, e.g., Rhizobium.