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BackgroundThe hoverfly   Microdon  ( Chymophila )  katsurai   Maruyama et Hironaga 2004 was speculated to be a myrmecophilous species associated with the ant    Polyrhachis   lamellidens    based on observations of adults near the ant nest. However, there have been no reports regarding the observation of immature stages of this species in association with    P.   lamellidens   .New informationFor the first time, we found three    M.   katsurai    larvae inside a    P.   lamellidens    nest and conducted rearing experiments on the larval    M.   katsurai   .    P.   lamellidens    workers did not show any inspection or attack behavior against the    M.   katsurai    larvae under rearing conditions, suggesting that    M.   katsurai    larvae can survive inside a    P.   lamellidens    nest. Although no predatory behavior by the    M.   katsurai    larvae was observed, all the    M.   katsurai    larvae pupated and emerged in a rearing environment. The dorsal surface of the larval    M.   katsurai    has a distinct pale green color with a uniform reticular structure. The puparium of    M.   katsurai    shows several morphological features that are characteristic of the subgenus    Chymophila   . We conclude that    M.   katsurai    is likely a myrmecophilous species that utilizes    P.   lamellidens    as a specific host and that classification of    M.   katsurai    based on puparium morphology is concordant with that based on adult morphology.

Rearing and observation of immature stages of the hoverfly Microdon katsurai ( Diptera , Syrphidae )