Cryptanaerobacter is a genus in the phylum Bacillota (Bacteria).
The name Cryptanaerobacter derives from: Greek cryptos (κρυπτός), hidden; an (ἄν), not; aer, aeros (ἀήρ, ἀέρος), air; Neo-Latin, a rod bacter, nominally meaning "a rod", but in effect meaning a bacterium, rod; giving Cryptanaerobacter, an anaerobic rod that is hidden within the consortium.
The genus contains a single species, Cryptanaerobacter phenolicus (Juteau et al. 2005, (ype species of the genus). The specific name is from Latin phenol, phenol; icus, suffix used in adjectives with the sense of belonging to; giving phenolicus, belonging to phenol.)[1]