thermococcus stetteri thermococcus stetteri thermococcus stetteri is an extremely thermophilic, marine, sulfur-metabolizing archaebacterium. it is anaerobic, its cells being irregular cocci 1 to 2 μm in diameter. of the strains first isolated, two were motile due to a tuft of flagella, while the other two strains were nonmotile. its type strain is k-3 (dsm 5262). it can grow on starch, pectin, and peptides, but not amino acids. thermococcus stetteri scientific classification domain: archaea kingdom: euryarchaeota phylum: euryarchaeota class: thermococci order: thermococcales family: thermococcaceae genus: thermococcus species: t. stetteri binomial name thermococcus stetterimiroshnichenko 1990