carboxydothermus islandicus carboxydothermus islandicus carboxydothermus islandicus is a thermophilic and anaerobic bacterium from the genus of carboxydothermus which has been isolated from a hot spring on iceland. carboxydothermus islandicus scientific classification domain: bacteria phylum: bacillota class: clostridia order: clostridiales family: peptococcaceae genus: carboxydothermus species: c. islandicus binomial name carboxydothermus islandicusnovikov et al. 2011 type strain dsm 21830, set is-9, vkm b-2561