Picrophilus oshimae is a species of Archaea described in 1996.[1]Picrophilus oshimae was found in a fumarole in Hokkaido, Japan. The hot spring the fumarole was located in had a pH of 2.2.[2]
L. C. M. van de Vossenberg, Jack; J. M. Driessen, Arnold; Zillig, Wolfram; Konings, W. N. (May 1998). "Bioenergetics and cytoplasmic membrane stability of the extremely acidophilic, thermophilic archaeon Picrophilus oshimae". Extremophiles. 2 (2): 67–74. doi:10.1007/s007920050044. PMID9672680. S2CID13181294.