Abstract
Mariprofundaceae belongs to the order Mariprofundales, within the class Zetaproteobacteria. The family Mariprofundaceae embraces a single genus Mariprofundus, and a single species Mariprofundus ferrooxydans. Cells are motile curved rods and appearGram-negative by transmission electron microscopy. Itis obligatory lithotrophic; requires Fe 2+ , marine salts; and is oxygen dependent. For decades, it had been known that neutrophilic Fe-oxidizing bacteria (FeOB) are associated with hydrothermal venting of Fe(II)-rich fluids associated with seamounts in the world’s oceans. The evidence originated from the mineralogical remains of the microbes. Recent culture and culture-independent techniques were employed to study Fe-rich microbial mats associated with hydrothermal venting at a submarine volcano. For the first time two iron-oxidizing strains ‐ PV-1 and JV-1 ‐ were isolated and characterized phenotypically and phylogenetically, resulting in the description of z (Zeta)-proteobacteria class nov., Mariprofundales ord. nov., Mariprofundaceae fam. nov. and Mariprofundus ferrooxydans sp. nov.
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