Treponemataceae

noun plural

Trep·​o·​ne·​ma·​ta·​ce·​ae ˌtrep-ə-ˌnē-mə-ˈtā-sē-ˌē 

in former classifications

: a family of the order Spirochaetales comprising small variable spirochetes without obvious structural differentiation and including a number of important pathogens