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Genus Nitella
- fragile branching stoneworts
Genus Rhodymenia
- type genus of the family Rhodymeniaceae
Genus Peridinium
- type genus of the family Peridiniidae
Genus Leishmania
- flagellate protozoan that causes leishmaniasis
Genus Costia
- a genus of flagellate protoctist
Genus Giardia
- flagellates parasitic in intestines of vertebrates