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Sticker of Rugose stag beetle
Bug card No. 3694 of 4,939

Rugose stag beetle

Sinodendron rugosum
Eats: PlantsBeetlesForests and woods6 legs

The rugose stag beetle is a small, shiny black beetle covered in lots of tiny pits, so it looks bumpy all over. The male has a short horn on his head, a bit like a little rhino. It lives in damp woods on the west coast of North America.

Lives in
Western North America, from British Columbia to California, in damp woods
Length
1.1 to 1.8 cm (0.43 to 0.71 in)
Top speed
about 0.27 km/h (0.17 mph)
On foot, estimate
Can it hurt you?
Harmless
Harmless. It has only small jaws, so you can just watch it walk along the ground.
What does it eat?
The grown-up beetles may sip plant juices or the sweet, sticky honeydew that aphids leave behind. Its larvae live inside old, rotting wood.
For real!Photo of Rugose stag beetle
Picture by Mprebus. CC BY-SA 3.0, via Wikimedia Commons.

How big is it?

How long is it?

Rugose stag beetle about 1.8 cm long (0.71 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 3 grains of rice in a rowcould run across a dinner table in 13 seconds

How big is Rugose stag beetle compared to YOU?

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How fast is it?

cool stuff

Fun facts

1

Its babies are white and curled up like the letter C. They hatch on tree bark and dig their way into rotting wood.

2

Males sometimes push each other with their horns to decide who is the boss.

3

It is the only beetle of its kind in western North America.

4

In spring and early summer you are most likely to find the grown-up beetles walking on the forest floor.

you asked

Most asked questions about Rugose stag beetle

?How big is the rugose stag beetle?

It is about 1 to 2 centimetres long, so it fits easily on a fingertip.

?Is the rugose stag beetle dangerous?

No. Its jaws are small and it is harmless to people.

For bug experts

Scientific name
Sinodendron rugosum
Group
Beetles
Family
Lucanidae
Classification
Insecta > Coleoptera > Lucanidae
Lives on
North America

Where the facts come from

  1. Sinodendron rugosum (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 Mprebus. 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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More from the same group: Beetles

Also at home here: Forests and woods

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