Bacillus clarkii is a facultative anaerobe bacterium.

[1] It is a gram positive, alkaliphilic and alkalitolerant, aerobic endospore-forming bacteria.

"Gamma-Cyclodextrin Production Using Cyclodextrin Glycosyltransferase from Bacillus clarkii 7364".

Yoshimune, Kazuaki; Morimoto, Hajime; Hirano, Yu; Sakamoto, Junshi; Matsuyama, Hidetoshi; Yumoto, Isao (20 March 2010).

"The obligate alkaliphile Bacillus clarkii K24-1U retains extruded protons at the beginning of respiration".