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. ——————————————