Phylogeny

Fig. 2. Simplified Phylogenetic Tree of The Three Domains

Domain: Bacteria  
[unicellular organism whose cell wall is made up of peptidoglycan]

Kingdom: Prokaryotae  
[lack of a membrane-bound nucleus and other complex organelles]

Fig.3. Mixed Population
of Spirochaetes

Phylum: Spirochaetes  
[diderm (double-membrane) and helically (spiral-shaped) coiled bacteria that move around using a flagellum located outside its plasma membrane]

Class: Spirochaetes

Order: Spirochaetales  
[parasitic and pathogenic spirochaetes]

Family: Spirochaetaceae  
[anaerobic (can survive without air) organisms 
that are most notable for causing Lyme disease and relapsing fever]

Genus: Borrelia  
[cause zoonotic, vector-borne diseases transmitted primarily by ticks]

Species: B. burgodorferi