Opomyzidae family is similar to genus of Geomyza and Opomyza. They are often combined with other Diptera from Chloropidae family.
Easily identified by spots on their wings, adults are on average between 3 and 4 mm.

Agrostis Tall Oat Bermudagrass Crested dog’s-tail Orchard grass Fescue Timothy Veldtgrass Maize Bluegrass Ryegrass Foxtail
Geomyza combinata L. X X X X X X
Geomyza tripunctata Fall X X X X X
Opomyza florum L. X X X X
Opomyza germinationis L. X X X X X X X
Opomyza petrei Mesnil X X

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