Strigomonadinae is a subfamily of protists in the order Trypanosomatida. All species in this taxon harbor endosymbiontic bacteria of the "Candidatus Kinetoplastibacterium" genus.
Use as model organisms Several species of the Strigomonadinae, notably Strigomonas culicis and Angomonas deanei have been researched as "excellent models for the study of cell evolution because the host protozoan co-evolves with an intracellular bacterium in a mutualistic relationship", and "the origin of new organelles" (i.e. symbiogenesis).
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