Pyrofollis japonicus gen. nov. sp. nov., a novel member of the family Pyrodictiaceae isolated from the Iheya North hydrothermal field.

A novel hyperthermophilic, heterotrophic archaeon, strain YC29, was isolated from a deep-sea hydrothermal vent in the Mid-Okinawa Trough, Japan. Cells of strain YC29 were non-motile, irregular cocci with diameters of 1.2-3.