coccobacteria

from The Century Dictionary.

• A group of bacteria, containing globular forms, such as those of the genus Micrococcus, and the rod-like forms, as those of the genera Bacterium and Bacillus, under a single species, Coccobacteria septica, as an assumption that they constitute essentially one organism, which takes on the form either of globular cells or of rods, these either reproducing identical forms or passing into each other, with accompanying variations in size and in combination.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Plural form of coccobacterium.