Bacilli (singular bacillus): Stick-like bacteria with rounded, tepered, square or swollen ends; with a size measuring 1-10μm in length by 0.3-1.0μm in width.
Coccobacilli (singular coccobacillus): Short rods.
Spiral: Spiral shaped bacteria with regular or irregular distance between twisting.
Eg. Spirilla and spirochaetes
Fig. 1.5 Morphology of Bacteria