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What you should know:

Aquifex are Gram-negative rod-shaped thermophilic bacteria. They are chemolithotrophic autotrophs that feed on hydrogen sulfide or hydrogen gas. Their unusual membrane structure and preferred environment resemble those of the archaea.


Domain Bacteria

    Phylum Aquifeci

Bergey's Manual Volume 1: The Archaea and the deeply branching and phototrophic Bacteria