thermonema thermonema thermonema is a gram-negative, chemoheterotrophic and aerobic genus from the phylum bacteroidota. thermonema scientific classification domain: bacteria phylum: bacteroidota class: cytophagia order: cytophagales family: thermonemataceaemunoz et al. 2016 genus: thermonemahudson et al. 1989 species t. lapsum hudson et al. 1989 t. rossianum nobre et al. 1997