Protozoa. Polyphyletic group of unicellular heterotrophic eukaryotes; not a single Kingdom. Protista is used in the five kingdom scheme and includes unicellular algae types. Ecologically these are saprotrophic, predatory, or parasitic (some mixotrophs)
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e.g. Trichonympha spp in termite hindgut
Oxymonads: Include some anaerobic flagellates with spirochete symbionts.
Nosema bombycis is an silkworm parasite; infect endothelial cells of intestine.
Trypanosoma spp. are hemoflagellates, transmitted by insect bites; insects are host: Tsetse fly an African sleeping sickness (T. brucei gambiense); Chagas’ disease by “kissing bug” causes legions (T. cruzi).