thermostilla thermostilla thermostilla is a thermophilic genus of bacteria from the family of planctomycetaceae with one known species (thermostilla marina). thermostilla marina has been isolated from a hydrothermal vent from a vulcano island in italy. thermostilla scientific classification domain: bacteria phylum: planctomycetota class: planctomycetia order: pirellulales family: thermoguttaceae genus: thermostillaslobodkina et al. 2016 type species thermostilla marina species t. marina