noun (plural spirilla /-lə/)
A bacterium with a rigid spiral structure, found in stagnant water and sometimes causing disease.
- Genus Spirillum; Gram-negative.
- Possibly it is a true spirillum, portions of which appear in the comma shape, much as in other spirilla - e.g., spirilla undula, which do not always form complete spirals, but consist only of more or less curved rods.
- These very long, spiraled nascent bdellovibrio were proposed earlier from electron microscope images to be common in spirilla, which are long and coiled themselves.
- The retention of the normal shape that we observed may be caused by steric restrictions on a major change in shape and size by neighboring spirilla and bdellovibrios.
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