Pachygaster is a genus of flies in the family Stratiomyidae.

Pachygaster differ from other Pachygastrinae morphologically in that their wings have separate R4 and R5 radial veins, their scutellum lacks a distinct posterior rim, and the hairs on the sides of their mesonotum are not flattened.

Species Pachygaster annulipes Brunetti, 1920 Pachygaster antiquus James, 1971 Pachygaster atra (Panzer, 1797) Pachygaster characta Kraft & Cook, 1961 Pachygaster dorsalis Lindner, 1957 Pachygaster emerita Krivosheina & Freidberg, 2004 Pachygaster flavimanus Lindner, 1957 Pachygaster flavipennis Hull, 1942 Pachygaster hymenaea Grund & Hauser, 2005 Pachygaster kerteszi Szilády, 1941 Pachygaster leachii Curtis, 1824 Pachygaster maura Lindner, 1939 Pachygaster montana Kraft & Cook, 1961 Pachygaster piriventris Rozkošný & Kovac, 1998 Pachygaster pulcher Loew, 1863 Pachygaster subatra Krivosheina, 2004 Pachygaster wirthi James, 1967

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