thermococcus hydrothermalis thermococcus hydrothermalis thermococcus hydrothermalis is a hyperthermophilic archaeon. it is strictly anaerobic and coccus-shaped, and its cells range from 0.8 to 2.0 μm in diameter, with type strain al662t. it was isolated from a hydrothermal vent in the east pacific rise. this species is notable for its α-glucosidase, which functions optimally at a temperature of 110 °c. thermococcus hydrothermalis scientific classification domain: archaea kingdom: euryarchaeota phylum: euryarchaeota class: thermococci order: thermococcales family: thermococcaceae genus: thermococcus species: t. hydrothermalis binomial name thermococcus hydrothermalisgodfroy et al. 1997