nautilia nautilia nautilia is a genus of bacteria from the family of synergistaceae. nautilia scientific classification domain: bacteria phylum: campylobacterota class: "nautiliia" order: nautiliales family: nautiliaceae genus: nautiliamiroshnichenko et al. 2002 type species nautilia lithotrophica species n. abyssi n. lithotrophicai n. nitratireducensi n. profundicolai