rhodothermus marinus rhodothermus marinus rhodothermus marinus is a species of bacteria. it is obligately aerobic, moderately halophilic, thermophilic, gram-negative and rod-shaped, about 0.5 μm in diameter and 2-2.5 μm long. rhodothermus marinus scientific classification kingdom: bacteria phylum: rhodothermota class: rhodothermia order: rhodothermales family: rhodothermaceae genus: rhodothermus species: r. marinus binomial name rhodothermus marinusalfredsson et al. 1995