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Sticker of Thistle tortoise beetle
Bug card No. 4351 of 4,939

Thistle tortoise beetle

Cassida rubiginosa
Eats: PlantsBeetlesGardens and meadows6 legs

The thistle tortoise beetle is a round green beetle that looks like a tiny turtle. Its wide, flat shell covers its head and legs, so from above you can hardly see them. It lives on thistles and munches their leaves.

Lives in
Europe, Siberia and North America, in fields, meadows and pastures with thistles
Length
6 to 8 mm (0.24 to 0.31 in)
Top speed
about 0.37 km/h (0.23 mph)
On foot, estimate
Can it hurt you?
Harmless
Harmless. It does not bite or sting.
What does it eat?
It eats the leaves of thistles and other plants of the daisy family.
For real!Photo of Thistle tortoise beetle
Picture by Francisco Welter-Schultes. CC0, via Wikimedia Commons.

How big is it?

How long is it?

Thistle tortoise beetle about 8 mm long (0.31 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 run across a dinner table in 9.7 seconds

How big is Thistle tortoise beetle compared to YOU?

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How fast is it?

cool stuff

Fun facts

1

Its shell works like a shield that bends, so the jaws of enemies cannot get underneath.

2

Its name rubiginosa means rusty, because dead beetles turn brown.

3

Farmers in some countries use it on purpose to eat weedy thistles.

4

It protects its eggs with a special covering it makes itself.

you asked

Most asked questions about Thistle tortoise beetle

?Why is it called a tortoise beetle?

Its round shell covers its whole body like the shell of a tortoise.

?Is the thistle tortoise beetle harmful?

No. It is harmless to people, and it even helps farmers by eating weedy thistles.

For bug experts

Scientific name
Cassida rubiginosa
Group
Beetles
Family
Chrysomelidae
Classification
Insecta > Coleoptera > Chrysomelidae
Lives on
Europe, Asia, North America

Where the facts come from

  1. Thistle tortoise beetle (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 Francisco Welter-Schultes. CC0, 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

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