General Information: This organism is the obligate endosymbiont for the tsetse fly Glossina brevipalpis. As Wigglesworthia brevipalpis resides intracellularly, the resulting co-evolution with its host over millions of years has led to a drastic reduction in the bacterium's genome size, resulting in this its inability to survive outside the host. Tsetse fly endosymbiont. This organism is the obligate endosymbiont for the tsetse fly Glossina brevipalpis, Glossina tachinoides, Glossina palpalis palpalis, and Glossina austeni. The tsetse fly is a vector for African trypanosomes, and is the main transmitter of deadly diseases in animals and humans in Africa. The fly feeds on a restricted diet, exclusively consisting of vertebrate blood, and lacks certain metabolic compounds needed for survival and reproduction. To complement this lack in nutrients, the tsetse fly relies mainly on the intracellular bacterial symbiont, Wigglesworthia glossinidia for its viability and fecundity.