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Sticker of Smoky-winged woodlouse fly
Bug card No. 3957 of 4,939

Smoky-winged woodlouse fly

Melanophora roralis

The smoky-winged woodlouse fly is a tiny black fly with hairy feelers and a shiny back. Its life is tied to woodlice, the little grey armoured crawlers you find under stones. The female has white spots on the tips of her wings.

Lives in
Europe, and brought to the Americas, where it lives from southern Canada to Chile and Argentina
Length
3 to 5.5 mm (0.12 to 0.22 in)
Top speed
about 6.6 km/h (4.1 mph)
Flying, estimate
Can it hurt you?
Harmless
Harmless. It is a tiny fly that does not bite or sting people.
What does it eat?
Its young are parasites of a common woodlouse, which means they live off it and feed on it.
For real!Photo of Smoky-winged woodlouse fly
Picture by iNaturalist user "treegrow" (Katja Schulz). CC BY 4.0, via Wikimedia Commons.

How big is it?

How long is it?

Smoky-winged woodlouse fly about 5.5 mm long (0.22 in)A grain of rice about 6 mm (0.24 in)A toy building brick about 3.2 cm (1.3 in)
small enough to sit on your fingernailcould fly across a whole football pitch in 57 secondsmoves 330 times its own body length every second

How big is Smoky-winged woodlouse fly compared to YOU?

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How fast is it?

cool stuff

Fun facts

1

A female can lay about 190 to 240 eggs in only about 7 hours.

2

It takes up to 21 days for its young to turn into a pupa.

3

It flies from mid-May to October, in old forests and damp places near the shore.

4

It first lived in Europe and was carried to North America by people.

you asked

Most asked questions about Smoky-winged woodlouse fly

?What does the woodlouse fly do to woodlice?

Its young live off a woodlouse as parasites.

?How big is the smoky-winged woodlouse fly?

Tiny. It is only 3 to 5.5 millimetres long.

?Is the woodlouse fly dangerous to people?

No. It does not bite or sting people.

For bug experts

Scientific name
Melanophora roralis
Group
Flies and mosquitoes
Family
Calliphoridae
Classification
Insecta > Diptera > Calliphoridae
Lives on
Europe, North America, South America

Where the facts come from

  1. Melanophora roralis (Wikipedia, CC BY-SA 4.0): what it looks like, where it lives, what it eats, sizes and fun facts, retold in simple words.
  2. Picture by iNaturalist user "treegrow" (Katja Schulz). CC BY 4.0, Wikimedia Commons. The sticker of this bug is drawn from this picture.

If we got something wrong, sorry, we are bug fans, not a science journal. Tell us at [email protected] and we will fix it.

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More from the same group: Flies and mosquitoes

Also at home here: Forests and woods

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