Re-description, systematics and complete mitochondrial genome of Philhelius coreanus (Shiraki, 1930) (Diptera, Syrphidae) in the Republic of Korea

To address these gaps, we here provide a diagnosis, re-description and mitochondrial genome of <i>Philheliuscoreanus</i> (Shiraki, 1930). We evaluated genitalic characters of both males and females with colour photographs and they showed intraspecific variation. There was significant variation in the yellow spots on the pleuron, particularly in females. After obtaining the complete mitochondrial genome of <i>P.coreanus</i>, we performed a phylogenetic analysis using Maximum Likelihood, based on 13 protein-coding genes, with a focus on relationships within the tribe Syrphini. Our results supported the monophyly of Syrphini, showing a sister-group relationship between <i>Philhelius</i> and <i>Doros</i> Meigen, 1822. Furthermore, the <i>Philhelius</i> + <i>Doros</i> clade was closely related to the <i>Chrysotoxum</i> + <i>Dideopsis</i> clade, with relatively high support. The newly-obtained mitochondrial genome of <i>P.coreanus</i> and high-resolution phylogenetic analysis provide essential resources for further analyses of the genus and relationships within Syrphini.