colwellia arctica colwellia arctica colwellia arctica is a gram-negative and facultatively anaerobic bacterium from the genus of colwellia which has been isolated from marine sediment from the arctic. colwellia arctica scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: alteromonadales family: colwelliaceae genus: colwellia species: c. arctica binomial name colwellia arcticawang et al. 2015 type strain atcc baa-2609, cicc 10860, strain 435