Angomonas deanei is a flagellated trypanosomatid. It is an obligate parasite in the gastrointestinal tract of insects, and is in turn a host to symbiotic bacteria. The bacterial endosymbiont maintains a permanent mutualistic relationship with the protozoan such that it is no longer able to reproduce and survive on its own. The symbiosis is similar to that found in another protist Strigomonas culicis.