Grass Sheathminer Fly

Cerodontha dorsalis · Order: Diptera · Family: Agromyzidae

No source yet on danger. We have no source yet on whether it bites, stings or damages anything.
Grass Sheathminer Fly
Photo: Scott Morris, CC BY

The grass sheathminer fly belongs to the family Agromyzidae. It is found in Canada, the United States, Mongolia, and the Neotropical region.

Source: Wikipedia

Where it comes from

It occurs in Canada, the United States, Mongolia, and the Neotropical region.

Source: Wikipedia

Where it is found in the US

Recorded in 33 of 51 states and DC. Most records: California, Illinois, New York, North Carolina, Pennsylvania, Massachusetts, Maryland, Tennessee.

Darker = more records. Counts are museum and citizen-science records, not population size.

Source: GBIF

Status: native in North America; native in Canada. Source: iNaturalist

Months it is reported in the US

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Source: GBIF

More photos

Grass Sheathminer Fly photo 2
Photo: W Rao, CC BY
Grass Sheathminer Fly photo 3
Photo: Rose Zappa, CC BY
Grass Sheathminer Fly photo 4
Photo: Ryan Donnelly, CC BY
Grass Sheathminer Fly photo 5
Photo: Ryan Sorrells, CC BY

Same family (Agromyzidae)

European Holly LeafminerEuropean Holly LeafminerPhytomyza ilicisJewelweed Leaf-miner FlyJewelweed Leaf-miner FlyPhytoliriomyza melampygaAgromyza vockerothiAgromyza vockerothiAgromyza vockerothiDamages trees, gardens or cropsCalycomyza flavinotumCalycomyza flavinotumCalycomyza flavinotumNemorimyza posticataNemorimyza posticataNemorimyza posticataDogwood leaf-mining flyDogwood leaf-mining flyPhytomyza agromyzinaDamages trees, gardens or crops

Sources

  • Wikipedia: https://en.wikipedia.org/wiki/Cerodontha_dorsalis

Look it up elsewhere: GBIF · iNaturalist · BugGuide · ITIS · Wikipedia

Text written 2026-10-24 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-24.

How this page works

This is one bug's fact sheet. The colored box at the top says whether it is dangerous. Sections below cover how to recognize it, whether it is a pest, and how to deal with it. The US map shows which states have records; tap a state to see other bugs there.

Every fact on Bug FAQ comes from a named source (university extension sites, government agencies, GBIF, iNaturalist, Wikipedia). The source is linked next to each section. If we have no source for something, we leave it out.