leptospiraceae leptospiraceae the leptospiraceae are a family of spirochete bacteria. it includes the genus leptospira which contains some pathogenic species. leptospiraceae leptospira interrogan scientific classification domain: bacteria phylum: spirochaetota class: spirochaetia order: leptospiralesgupta et al. 2014 family: leptospiraceaehovind-hougen 1979 genera leptonema leptospira turneriella systematic these genera belong to the family leptospiraceae: leptonema (with species leptonema illini) leptospira turneriella