Strigomonadinae is a subfamily of protists in the order

Trypanosomatida Trypanosomatida is a group of kinetoplastid unicellular organisms distinguished by having only a single flagellum. The name is derived from the Greek ''trypano'' (borer) and ''soma'' (body) because of the corkscrew-like motion of some trypanosom ...

. All species in this taxon harbor endodymbiontic 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-evolve In biology, coevolution occurs when two or more species reciprocally affect each other's evolution through the process of natural selection. The term sometimes is used for two traits in the same species affecting each other's evolution, as well a ...

s with an intracellular bacterium in a mutualistic relationship", and "the origin of new organelles" (i.e.

symbiogenesis Symbiogenesis (endosymbiotic theory, or serial endosymbiotic theory) is the leading evolutionary theory of the origin of eukaryotic cells from prokaryotic organisms. The theory holds that mitochondria, plastids such as chloroplasts, and possibl ...

References

Trypanosomatida Parasitic excavates Taxa described in 2014 {{Excavata-stub