"Clostridium nigrificans" Werkman and Weaver 1927 Dataset NCBI Taxonomy Classification phylum Bacillota class Clostridia order Eubacteriales family Desulfotomaculaceae genus Desulfotomaculum species Desulfotomaculum nigrificans Name Homonyms "Clostridium nigrificans" Werkman and Weaver 1927 Clostridium nigrificans