26 MANUAL OF DETERMINATIVE BACTERIOLOGY 



Family 3. Nitrobacteriaceae 



Genus a. Nitrobacter 



b. Rhodobacterium 



c. Rhodocystis 



d. Didymohelix 



e. Sideromonas 



f. Siderocapsa 



g. Chondromyces 

 h. Polyangium 



i. Amoebobacter 

 j. Thiodictyon 

 Family 4. Azotobacteriaceae 

 Genus a. Rhizobium 

 b. Azotobacter 

 Order 3. Leptotrichales 



Family 1. Leptotrichaceae 

 Genus a. Leptothrix 



b. Sphaerotilus 



c. Crenothrix 

 Family 2. Clonothrichaceae 



Genus a. Clonothrix 

 Order 4. Rhabdonionadales 



Family 1. Rhabdomonadaceae 

 Genus a. Beggiatoa 



b. Rhabdomonas 



c. Thioploca 



d. Thiothrix 

 Family 2. Spirochaetaceae 



Genus a. Spirochaeta 



b. Treponema 



c. Leptospira 



d. Cristispira 



e. Saprospira 

 Subclass B. Eubacteria 



Order 1. Aerobacteriales 



Family 1. Aero6ac<enoceae 

 Genus a. Aerobacter 

 h. Escherichia 



c. Salmonella 



d. Eberthella 



e. Shigella 

 Family 2. Pasteurellaceae 



Genus a. Pasteurella 



b. Brucella 



c. Haemophilus 



d. Neisseria 

 Order 2. Plocamobacteriales 



Family 1. Streptococcaceae 

 Genus a. Streptococcus 



Family 2. Ulvinaceae 

 Genus a. Proteus 

 h. Kurthia 



