Nanobacterium

Rarity: Common

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What Wikipedia says

Nanobacterium ( NAN-oh-bak-TEER-ee-əm, pl. nanobacteria NAN-oh-bak-TEER-ee-ə) is the name of a discredited former proposed class of microorganisms, with a size much smaller than the generally accepted lower limit for life (about 200 nm for bacteria, like mycoplasma).

Excerpt from the Wikipedia article “Nanobacterium”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: NASA, Public domain, via Wikimedia Commons.