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Sticker of Say's mantidfly
Bug card No. 3753 of 4,939

Say's mantidfly

Dicromantispa sayi

Say's mantidfly is a strange insect that looks like a tiny praying mantis with see-through wings. It has grabbing front legs, a long slim neck and big colourful eyes. Its babies have a sneaky way of finding food: they hitch a ride on spiders.

Lives in
North America, Central America and the Caribbean, at forest edges and on prairies
Length
1.4 to 1.5 cm (0.55 to 0.59 in)
Top speed
about 3.4 km/h (2.1 mph)
Flying, estimate
Can it hurt you?
Harmless
Harmless. It is not a real mantis and cannot hurt people.
What does it eat?
The grown-ups catch small flying insects. The larvae eat spider eggs.
For real!Photo of Say's mantidfly
Picture by Gorillo.Chimpo. CC BY 4.0, via Wikimedia Commons.

How big is it?

How long is it?

Say's mantidfly about 1.5 cm long (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)
as long as 2.5 grains of rice in a rowcould fly across a whole football pitch in 110 secondsmoves 63 times its own body length every second

How big is Say's mantidfly compared to YOU?

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How fast is it?

cool stuff

Fun facts

1

A baby mantidfly climbs onto a mother spider and waits until she lays her eggs, then it sneaks into the egg sac to eat them.

2

It mainly uses wolf spiders as hosts for its babies.

3

Its front legs look like a praying mantis's, but it keeps them folded most of the time.

4

It flies only in late summer, from mid July to early September.

you asked

Most asked questions about Say's mantidfly

?Is Say's mantidfly a praying mantis?

No. It only has mantis-like front legs. It is a relative of lacewings.

?What does Say's mantidfly eat?

The adults eat small flying insects, and the larvae eat spider eggs.

For bug experts

Scientific name
Dicromantispa sayi
Group
Other insects
Family
Mantispidae
Classification
Insecta > Neuroptera > Mantispidae
Lives on
North America

Where the facts come from

  1. Dicromantispa sayi (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 Gorillo.Chimpo. 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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