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Genus Spirochaeta
- the type genus of the family Spirochaetaceae; a bacterium that is flexible, undulating, and chiefly aquatic
Genus Treponema
- type genus of Treponemataceae: anaerobic spirochetes with an undulating rigid body; parasitic in warm-blooded animals
Genus Borrelia
- small flexible parasitic spirochetes having three to five wavy spirals
Genus Leptospira
- very slender aerobic spirochetes; free-living or parasitic in mammals
Genus Amoeba
- protozoan inhabiting moist soils or bottom vegetation in fresh or salt water
Genus Endamoeba
- the type genus of the family Endamoebidae
Genus Globigerina
- type genus of the family Globigerinidae
Genus Arcella
- type genus of the Arcellidae
Genus Difflugia
- genus of protozoans related to ameba