thermococcus alcaliphilus thermococcus alcaliphilus thermococcus alcaliphilus is a hyperthermophilic archaeon. it is coccoid-shaped and heterotrophic, first isolated from a shallow marine hydrothermal system at vulcano island, italy. its type strain is aedii12 (dsm 10322). thermococcus alcaliphilus scientific classification domain: archaea kingdom: euryarchaeota phylum: euryarchaeota class: thermococci order: thermococcales family: thermococcaceae genus: thermococcus species: t. alcaliphilus binomial name thermococcus alcaliphiluskeller et al. 1997