desulfocapsa sulfexigens desulfocapsa sulfexigens desulfocapsa sulfexigens is a mesophilic, anaerobic, gram-negative bacterium. it disproportionates elemental sulfur and thiosulfate. sb164p1 is its type strain. desulfocapsa sulfexigens scientific classification domain: bacteria phylum: thermodesulfobacteriota class: desulfobulbia order: desulfobulbales family: desulfocapsaceae genus: desulfocapsa species: d. sulfexigensfinster et al. 1998 binomial name desulfocapsa sulfexigens