Treponema pallidum Nichols Dataset NCBI Taxonomy Classification kingdom Pseudomonadati phylum Spirochaetota class Spirochaetia order Spirochaetales family Treponemataceae genus Treponema species Treponema pallidum Name Homonyms Treponema pallidum Treponema pallidum Nichols Treponema pallidum (Schaudinn and Hoffmann 1905) Schaudinn 1905