---
title: "Narrow-headed Marsh Fly"
description: "Helophilus fasciatus — Insectos y arañas. Helophilus fasciatus (Walker, 1849), the narrow-headed marsh fly, is an abundant species of syrphid fly observed throughout the United States and Canada."
canonical: https://animalchecklist.com/es/animal/narrow-headed-marsh-fly
last_updated: 2026-09-20
---

# Narrow-headed Marsh Fly

> Helophilus fasciatus — Insectos y arañas. Helophilus fasciatus (Walker, 1849), the narrow-headed marsh fly, is an abundant species of syrphid fly observed throughout the United States and Canada.

- Scientific name: *Helophilus fasciatus*
- Category: `insects` (Insectos y arañas)
- Habitats: `freshwater` (Lagos y ríos), `farm` (Granja)
- iNaturalist observations: 20021
- Wikidata: [Q10766583](https://www.wikidata.org/wiki/Q10766583)
- iNaturalist taxon: [119561](https://www.inaturalist.org/taxa/119561)

## Names

- en: Narrow-headed Marsh Fly
- fr: Syrphe fascié

## Countries with the most observations

US (13863), CA (5165)

## Summary

Helophilus fasciatus (Walker, 1849), the narrow-headed marsh fly, is an abundant species of syrphid fly observed throughout the United States and Canada. Hoverflies can remain nearly motionless in flight. The adults are also known as flower flies for they are commonly found on flowers, from which they get both energy-giving nectar and protein-rich pollen. The larvae of this genus are associated with wet decaying organic material, particularly accumulations of decaying vegetation in ponds and mud and farmyard manure or silage. The adults of this species lays eggs on vegetation overhanging the water. The larvae hatch…

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

## Photo

![Narrow-headed Marsh Fly](https://animalchecklist.com/img/animals/narrow-headed-marsh-fly/medium.jpg)

Photo: Brighton Lee · CC0 · inaturalist — https://www.inaturalist.org/observations/317345738

## Machine access

`GET https://animalchecklist.com/api/v1/animals/narrow-headed-marsh-fly?lang=es` — see [openapi.json](https://animalchecklist.com/openapi.json).