mycetocyte

Mycetocytes are specialized cells found in certain insects, such as true bugs. These cells contain unicellular, likely symbiotic, fungi. They are typically clustered together in paired organs called mycetomes.12

Insects with restricted diets, like those feeding on plant juices or sterile blood, rely on mycetocytes to house symbiotic microorganisms. These microorganisms are passed down through generations via eggs and provide essential nutrients, such as vitamins, to the host insect. Without these symbiotic microbes, an insect may fail to grow unless its diet is supplemented with vitamins. This symbiotic relationship is a form of endosymbiosis, where one organism lives within another, often to their mutual benefit.34