Planococcus halocryophilus Mykytczuk et al. 2012 Mykytczuk N.C.S. Wilhelm R.C. Whyte L.G. Planococcus halocryophilus sp. nov., an extreme sub-zero species from high Arctic permafrost 2012 62 8 1937 1944 International Journal of Systematic and Evolutionary Microbiology Int J Syst Evol Microbiol 1466-5026 1466-5034 10.1099/ijs.0.035782-0 22003043