colwellia rossensis colwellia rossensis colwellia rossensis is a psychrophilic antarctic bacterial species with the ability to synthesize docosahexaenoic acid. it is non-pigmented, curved rod-like shaped, exhibiting facultative anaerobic growth and possessing an absolute requirement for sea water. its type strain is acam 608t. colwellia rossensis scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: alteromonadales family: colwelliaceae genus: colwellia species: c. rossensis binomial name colwellia rossensisbowman et al. 1998