Position in a system
| system | Vitae - living organisms |
| domain | Bacteria (Haeckel, 1894) Woese, Kandler Wheelis, 1990 - bacterians |
| phylum | Firmicutes |
| class | Clostridia Rainey, 2010 |
| order | Clostridiales Prévot, 1953 |
| family | Clostridiaceae Pribram, 1933 |
| genus | Clostridium Prazmowski, 1880 |
| species | Clostridium tetani (Flügge, 1886) Bergey et al., 1923 |