polaribacter irgensii polaribacter irgensii polaribacter irgensii is a species of gas vacuolate polar marine bacteria. it was first isolated from sea ice and water from the arctic and the antarctic. its type strain is atcc 700398. polaribacter irgensii scientific classification domain: bacteria phylum: bacteroidota class: flavobacteriia order: flavobacteriales family: flavobacteriaceae genus: polaribacter binomial name p. irgensiigosink et al. 1998