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Sticker of Red spotted parasite fly
Bug card No. 3538 of 4,939

Red spotted parasite fly

Eriothrix rufomaculata

The red spotted parasite fly is a bristly fly with a grey striped back and orange patches on the sides of its tail end. Its face shines silvery. It is common in sunny meadows and along hedges.

Lives in
Europe and much of Asia, including Estonia
Length
0.5 to 1 cm (0.2 to 0.39 in)
Wingspan
1.3 to 1.5 cm (0.51 to 0.59 in)
Top speed
about 8.9 km/h (5.5 mph)
Flying, estimate
Can it hurt you?
Harmless
Harmless. It does not bite or sting.
What does it eat?
The grown-ups visit flowers such as hogweed and daisies. The larvae grow inside moth caterpillars that live underground.
For real!Photo of Red spotted parasite fly
Picture by James K. Lindsey. CC BY-SA 3.0, via Wikimedia Commons.

How big is it?

How long is it?

Red spotted parasite fly about 1 cm long (0.39 in)A grain of rice about 6 mm (0.24 in)A toy building brick about 3.2 cm (1.3 in)

How wide are its wings?

Red spotted parasite fly wings about 1.5 cm tip to tip (0.59 in)A grain of rice about 6 mm (0.24 in)A toy building brick about 3.2 cm (1.3 in)A crayon about 9 cm (3.5 in)
small enough to sit on your fingernailas long as 1.5 grains of rice in a rowcould fly across a whole football pitch in 42 secondsmoves 250 times its own body length every second

How big is Red spotted parasite fly compared to YOU?

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How fast is it?

cool stuff

Fun facts

1

Its larvae grow inside caterpillars of grass moths, tiger moths, lappet moths and ermine moths.

2

The grown-up flies are out from July to October.

3

There is only one family of these flies each year.

4

Its back has four narrow black stripes.

you asked

Most asked questions about Red spotted parasite fly

?Is the red spotted parasite fly dangerous?

No. It is harmless to people. Its larvae only live inside caterpillars.

?Where can I see the red spotted parasite fly?

On flowers like hogweed in sunny meadows, fields and hedges from July to October.

For bug experts

Scientific name
Eriothrix rufomaculata
Group
Flies and mosquitoes
Family
Tachinidae
Classification
Insecta > Diptera > Tachinidae
Lives on
Europe, Asia

Where the facts come from

  1. Eriothrix rufomaculata (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 James K. Lindsey. CC BY-SA 3.0, 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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