Rod shape is called Bacillus.
Two bacilli together - Diplobacilli
Chains of bacilli are called Streptobacilli
Palisades - Rods side by side or in X, V    or Y figures

Spiral shape that is rigid is called    Spirillium.
If the organism is flexible and undulating, it is called Spirochete.

Square shape is called Archaebacteria.
Pleomorphism - Different forms of the same species.