methylophaga thalassica methylophaga thalassica methylophaga thalassica is an obligately methylotrophic, gram-negative, strictly aerobic, motile, rod-shaped bacteria. its type strain is atcc 33146 (= ncmb 2163). methylophaga thalassica scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: thiotrichales family: piscirickettsiaceae genus: methylophaga species: m. thalassica binomial name methylophaga thalassicajanvier et al. 1985