Are Centipedes and Millipedes Considered Insects?
Are Centipedes and Millipedes Insects?
Many people assume that any small, crawling creature with lots of legs must be an insect. This common misconception often leads to questions like: Are centipedes insects? Are millipedes insects?
The short answer is no—centipedes and millipedes are not insects. While they may look similar at first glance, science classifies them very differently.
In this article, we’ll break down the differences in a simple, clear way and explain exactly what centipedes and millipedes are—and why they are not insects.
What Defines an Insect?
To understand why centipedes and millipedes are not insects, it helps to know what insects actually are.
Key Characteristics of Insects
Insects belong to the class Insecta and must have all of the following features:
- Six legs (three pairs)
- Three body segments: head, thorax, and abdomen
- One pair of antennae
- Usually wings (at least at some stage of life)
Examples of true insects include:
- Ants
- Butterflies
- Beetles
- Flies
- Bees
If an animal does not meet these criteria, it is not an insect.
Are Centipedes Considered Insects?
No, centipedes are not insects.
What Are Centipedes?
Centipedes belong to the class Chilopoda, which is part of a larger group called Myriapoda.
Why Centipedes Are Not Insects
Centipedes differ from insects in several major ways:
- They have many legs, not six
- One pair of legs per body segment
- Their bodies are long and flattened
- They have venomous claws used to capture prey
- No clear separation into head, thorax, and abdomen like insects
Centipedes are arthropods, meaning they share a distant relationship with insects, but they are not classified as insects.
Are Millipedes Considered Insects?
No, millipedes are also not insects.
What Are Millipedes?
Millipedes belong to the class Diplopoda, another group within Myriapoda.
Why Millipedes Are Not Insects
Millipedes have several distinct differences from insects:
- Two pairs of legs per body segment
- Cylindrical, rounded bodies
- Move slowly and feed mostly on decaying plant matter
- Do not sting or bite
- Have far more than six legs
Despite their name, millipedes do not actually have 1,000 legs, but they often have hundreds—far more than any insect.
Centipedes vs. Millipedes vs. Insects
| Feature | Insects | Centipedes | Millipedes |
|---|---|---|---|
| Number of legs | 6 | Many (1 pair per segment) | Many (2 pairs per segment) |
| Body segments | 3 | Many | Many |
| Speed | Varies | Fast | Slow |
| Diet | Diverse | Carnivorous | Herbivorous / decomposers |
| Classification | Insecta | Chilopoda | Diplopoda |
What Do Centipedes and Millipedes Have in Common With Insects?
Although they are not insects, centipedes and millipedes share some traits with them:
- All are arthropods
- Have exoskeletons
- Have segmented bodies
- Possess jointed legs
These similarities explain why people often group them together—but scientifically, they belong to different classes.
Why Are They Often Mistaken for Insects?
Centipedes and millipedes are often mistaken for insects because:
- They live in similar environments (soil, gardens, basements)
- They are small, crawling creatures
- They are commonly referred to as “bugs” in everyday language
However, in biology, the term “bug” is informal and does not mean “insect.”
Final Answer: Are Centipedes and Millipedes Insects?
No. Centipedes and millipedes are not insects.
- Insects belong to the class Insecta
- Centipedes belong to Chilopoda
- Millipedes belong to Diplopoda
They are all arthropods, but they are classified separately based on body structure, leg count, and biological traits.
Conclusion
While centipedes and millipedes may look like insects, science tells a different story. Understanding these differences helps clear up confusion and gives us a better appreciation of the incredible diversity of life around us.
Frequently Asked Questions (FAQ)
Are centipedes dangerous?
Most centipedes are harmless to humans, though some can deliver a painful bite.
Are millipedes harmful?
No. Millipedes do not bite or sting and are generally harmless.
Are centipedes and millipedes bugs?
In casual language, yes—but scientifically, they are not insects or true bugs.
Do centipedes and millipedes help the environment?
Yes. Millipedes help decompose organic matter, and centipedes help control insect populations.
