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Sticker of Rathke's woodlouse
Bug card No. 3490 of 4,939

Rathke's woodlouse

Trachelipus rathkii
Eats: Leftovers and dead thingsWoodliceGardens and meadows14 legsNot an insect, but a bug cousin

Rathke's woodlouse is a slate grey woodlouse with pale markings that look like three thin stripes down its back. It loves wet places and does not mind a flood. You can find it under stones, logs and bark.

Fun fact: woodlice are not insects. They are crustaceans, cousins of crabs and shrimps, that live on land.
Lives in
Europe, except around the Mediterranean, and now the northern United States and southern Canada
Length
1.5 cm (0.59 in)
Top speed
about 0.17 km/h (0.11 mph)
On foot, estimate
Can it hurt you?
Harmless
Harmless. It cannot bite or sting.
What does it eat?
Like other woodlice, it feeds on dead leaves, rotting wood and other dead plant bits.
For real!Photo of Rathke's woodlouse
Picture by Katja Schulz from Washington, D. C., USA. CC BY 2.0, via Wikimedia Commons.

How big is it?

How long is it?

Rathke's woodlouse 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 rowit has about 14 legscould run across a dinner table in 21 seconds

How big is Rathke's woodlouse compared to YOU?

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How fast is it?

cool stuff

Fun facts

1

It breathes with five pairs of tiny lungs on the underside of its body.

2

In riverside meadows that often flood, it can be the most common woodlouse of all.

3

Some females have orange blotches.

4

It was brought to North America and now lives as far west as Alberta in Canada.

you asked

Most asked questions about Rathke's woodlouse

?How big is Rathke's woodlouse?

It grows to about 1.5 centimetres long.

?Where can I find Rathke's woodlouse?

In damp places, under stones, dead wood, bark and in grass, especially near rivers.

For bug experts

Scientific name
Trachelipus rathkii
Group
Woodlice
Family
Trachelipodidae
Classification
Malacostraca > Isopoda > Trachelipodidae
Lives on
Europe, North America

Where the facts come from

  1. Trachelipus rathkii (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 Katja Schulz from Washington, D. C., USA. CC BY 2.0, 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: Woodlice

Also at home here: Gardens and meadows

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