---
title: "Thistle Stem Gall Fly"
description: "Urophora cardui — Insetti e ragni. Urophora cardui or the Canada thistle gall fly is a fruit fly which, contrary to its common name, is indigenous to Central Europe from the United Kingdom east to near the Crimea, and from Sweden south to the Mediterranean."
canonical: https://animalchecklist.com/it/animal/thistle-stem-gall-fly
last_updated: 2026-09-20
---

# Thistle Stem Gall Fly

> Urophora cardui — Insetti e ragni. Urophora cardui or the Canada thistle gall fly is a fruit fly which, contrary to its common name, is indigenous to Central Europe from the United Kingdom east to near the Crimea, and from Sweden south to the Mediterranean.

- Scientific name: *Urophora cardui*
- Category: `insects` (Insetti e ragni)
- Habitats: unknown
- iNaturalist observations: 7725
- Wikidata: [Q1128552](https://www.wikidata.org/wiki/Q1128552)
- iNaturalist taxon: [63066](https://www.inaturalist.org/taxa/63066)

## Names

- en: Thistle Stem Gall Fly
- de: Distelbohrfliege
- fr: Urophore des chardons
- nl: Distelgalboorvlieg

## Countries with the most observations

CA (2804), US (1446), GB (799), RU (505), DK (354), DE (163), PL (103), LT (101), FI (93), FR (86), NL (62), AT (51)

## Summary

Urophora cardui or the Canada thistle gall fly is a fruit fly which, contrary to its common name, is indigenous to Central Europe from the United Kingdom east to near the Crimea, and from Sweden south to the Mediterranean.

Text: Wikipedia (en), CC BY-SA 4.0 — https://en.wikipedia.org/wiki/Urophora_cardui

## Photo

![Thistle Stem Gall Fly](https://animalchecklist.com/img/animals/thistle-stem-gall-fly/medium.jpg)

Photo: msieges · CC0 · inaturalist — https://www.inaturalist.org/observations/34080394

## Machine access

`GET https://animalchecklist.com/api/v1/animals/thistle-stem-gall-fly?lang=it` — see [openapi.json](https://animalchecklist.com/openapi.json).