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Sticker of Trilobite beetle
Bug card No. 1366 of 1,500

Trilobite beetle

Platerodrilus
Eats: Leftovers and dead thingsBeetlesRainforests and jungles6 legs

The trilobite beetle is one of the strangest beetles in the world. The female never turns into a normal beetle. She stays flat and dark with big spiky plates, and looks like a trilobite, a sea animal that died out long, long ago.

Lives in
Tropical forests of India and Southeast Asia
Length
4 to 8 cm (1.6 to 3.1 in)
the female
Top speed
about 1.2 km/h (0.75 mph)
On foot, estimate
Can it hurt you?
Harmless
Harmless. It does not bite or sting. It just looks very unusual.
What does it eat?
The females eat rotting wood, fungi, slime moulds and tiny living things that help break down dead plants. The small males probably sip nectar.
For real!Photo of Trilobite beetle
Picture by Tiia Monto. CC BY-SA 3.0, via Wikimedia Commons.

How big is it?

How long is it?

Trilobite beetle about 8 cm long (3.1 in)A toy building brick about 3.2 cm (1.3 in)A crayon about 9 cm (3.5 in)A banana about 18 cm (7.1 in)
as long as 2.5 toy building bricks in a rowcould run across a dinner table in 3 seconds

How big is Trilobite beetle compared to YOU?

Just maths in your browser. Nothing is saved or sent anywhere.

How fast is it?

cool stuff

Fun facts

1

The males look completely different. They are small, about 8 to 9 millimetres long, and look like normal beetles with wings.

2

For a long time nobody could find the males. A Swedish scientist called Eric MjΓΆberg finally described them in 1925.

3

Trilobite beetles appeared about 47 million years ago, around 200 million years after real trilobites had died out.

4

The female keeps her larva shape for her whole life, even when she is grown up.

you asked

Most asked questions about Trilobite beetle

?Is the trilobite beetle a real trilobite?

No. Trilobites died out hundreds of millions of years ago. The trilobite beetle just looks like one.

?How big is a trilobite beetle?

The females are about 4 to 8 centimetres long. The males are tiny, less than 1 centimetre.

?What does the trilobite beetle eat?

The females eat rotting wood, fungi and slime moulds on the forest floor.

For bug experts

Scientific name
Platerodrilus
Group
Beetles
Family
Lycidae
Classification
Insecta > Coleoptera > Lycidae
Lives on
Asia
Also known as
Trilobite larva, Sumatran trilobite larva

Where the facts come from

  1. Platerodrilus (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 Tiia Monto. CC BY-SA 3.0, Wikimedia Commons. The round sticker of this bug is cut from the same 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.

More from the same group: Beetles

Also at home here: Rainforests and jungles