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Sticker of Halcyon giant centipede
Bug card No. 2168 of 4,939

Halcyon giant centipede

Scolopendra alcyona
Name means: “named after Alcyone, a woman in a Greek myth who turned into a kingfisher, because its legs are kingfisher blue”
Eats: Other bugs and small animalsCentipedes and millipedesPonds, rivers and shoresNot an insect, but a bug cousin

The Halcyon giant centipede is a big centipede with a shiny greenish-black to turquoise body. It can swim and hunts along forest streams. It is the biggest centipede in Japan.

Fun fact: this one is not an insect. Insects have six legs, and this cousin has many, many more.
Lives in
Islands of southern Japan (the Ryukyu Islands) and Taiwan, by forest streams
Length
20 cm (7.9 in)
Top speed
about 3.9 km/h (2.4 mph)
On foot, estimate
What does it eat?
It hunts big freshwater prawns in and near streams.
For real!Photo of Halcyon giant centipede
Picture by (c) ๆž—ๆญฃๆ–‡, some rights reserved (CC BY). CC BY 4.0, via Wikimedia Commons.

How big is it?

How long is it?

Halcyon giant centipede about 20 cm long (7.9 in)A crayon about 9 cm (3.5 in)A banana about 18 cm (7.1 in)A house cat about 50 cm (20 in)
as long as 6 toy building bricks in a rowas long as 1 bananas end to endcould run across a dinner table in 0.9 seconds

How big is Halcyon giant centipede compared to YOU?

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How fast is it?

cool stuff

Fun facts

1

It can grow to 20 centimetres long and 2 centimetres wide.

2

It was only described as a new species in 2021, the first new centipede found in Japan in 143 years.

3

It is only the third kind of Scolopendra centipede known to live partly in water.

4

It often hides under stones in streams.

5

Japan protects it so that collectors do not take too many.

you asked

Most asked questions about Halcyon giant centipede

?How big is the Halcyon giant centipede?

It can be about 20 centimetres long, the biggest centipede in Japan.

?Can the Halcyon giant centipede swim?

Yes. It lives along streams and hunts freshwater prawns in the water.

For bug experts

Scientific name
Scolopendra alcyona
Group
Centipedes and millipedes
Family
Scolopendridae
Classification
Chilopoda > Scolopendromorpha > Scolopendridae
Lives on
Asia

Where the facts come from

  1. Scolopendra alcyona (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 (c) ๆž—ๆญฃๆ–‡, some rights reserved (CC BY). 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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More from the same group: Centipedes and millipedes

Also at home here: Ponds, rivers and shores

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