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Bacteria come in many shapes-round, rod, comma, spiral and even square! When in multiple linked colonies they can also take up a variety of shapes.Typically these can be clusters, chains, cubic packets, squares and grape-like bunched clusters. 1999 The Centre for Microscopy and Microanalysis. Bacteria come in many shapes-round, rod, comma, spiral and even square! When in multiple linked colonies they can also take up a variety of shapes. Typically these can be clusters, chains, cubic packets, squares and grape-like bunched clusters.
The spiral bacteria are spirilla (singular form is spirillus) and the rod-shaped bacteria are bacilli (singular form is bacillus). The coccus (plural form is cocci) bacteria are spherical and are usually found in clusters or chains.Bacilli have a large surface area that helps them take in nutrients, but they may dry out easily.Cocci do not dry out as quickly and retain water, but they absorb nutrients slowly.he coccus (plural form is cocci) bacteria are spherical and are usually found in clusters or chains. Bacilli have a large surface area that helps them take in nutrients, but they may dry out easily. Cocci do not dry out as quickly and retain water, but they absorb nutrients slowly.