Molecular Detection of Endosymbionts in Phlebotomines and Temperature Preference Estimation and Its Relation with Microbiota with Emphasis onLutzomyia longipalpisDue to climate change, there is an increase in tropical diseases such as leishmaniasis, transmitted by some species of the genus Lutzomyia, as Lutzomyia longipalpis, vector of Leishmania infantum in America. In addition, the microbiota of insects is known to play a role in their immunity, directly impacting their vector competence to transmit pathogens.This justifies the need to explore the composition of the microbiota, the presence of endosymbionts and their potential relationship with temperature variations in Lu.longipalpis. For this reason, the molecular detection of Arsenophonus was conducted in populations of wild phlebotomines of Lu. longipalpis, Pintomyia evansi and Psychodopygus panamensis from Colombia. Subsequently, with a device with temperature gradient "MB-Thermocline", it was evaluated the temperature preference of Lu. longipalpis, Pi. evansi while populations of Aedes aegypti were used as a control in the assay. The PCR results showed the presence of Arsenophonus and interspecific differences (p-value < 0.05) were observed between phlebotomines, specifically between 25 °C and 31 °C where there was a greater abundance of Pi. evansi found in such compartments, however both species showed a marked preference towards the temperature of 21-23 °C, while Ae. aegypti prefered temperatures between 27-29 °C.Representative groups of Lu. longipalpis that presented temperature preference (phenotypes) in each compartment of the device, were used to perform an analysis of the microbiota using New Generation Sequencing techniques. The analysis of the microbiota of these groups shows that the communities have a significantly different taxonomic structure between temperature ranges (p-value < 0.013), the most abundant genera were