halanaerobacter lacunaris halanaerobacter lacunaris halanaerobacter lacunaris is a gram-negative and polyextremophile bacterium from the genus of halanaerobacter. halanaerobacter lacunaris scientific classification domain: bacteria phylum: bacillota class: clostridia order: halanaerobiales family: halobacteroidaceae genus: halanaerobacter species: h. lacunaris binomial name halanaerobacter lacunaris(zhilina et al. 1992) rainey et al. 1995 type strain tb21 synonyms haloanaerobacter lacunarishalobacteroides lacunaris