lacunisphaera parvula lacunisphaera parvula lacunisphaera parvula is a gram-negative and aerobic bacterium from the genus of lacunisphaera which has been isolated from a freshwater lake. lacunisphaera parvula scientific classification domain: bacteria phylum: verrucomicrobiota class: opitutae order: opitutales family: opitutaceae genus: lacunisphaera species: l. parvula binomial name lacunisphaera parvularast et al. 2017 type strain ig15