Species of protozoa
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Crithidia bombi is a parasitic protist from the order Trypanosomatida. It is the most prevalent parasite of bumblebees.
Ecology.
"Crithidia bombi" is an important parasite of various bumblebee species, including common species like "Bombus terrestris", "Bombus muscorum", and "Bombus hortorum". The parasites negatively impact reproductive fitness of "Bombus" queens, as they affect their ovarian development as well as early colony establishment after the queens emerge from hibernation.
References.
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