Centipedes are many-legged predators in the class Chilopoda. Silverfish are six-legged insects in the class Insecta that feed on materials such as starches and paper products. Compare their leg count, body shape, and feeding habits to tell these common household arthropods apart.
Centipede vs Silverfish: Key Differences & Interesting Facts
- Centipedes are active predators that hunt other small bugs; silverfish are scavengers that eat starches and sugary materials.
- While centipedes have one pair of legs per body segment, silverfish always have exactly six legs.
- Centipedes use venom to catch and paralyze their prey. Silverfish have no venom or stingers.
- Silverfish are covered in tiny metallic scales that give them a shimmering appearance.
- Centipedes belong to the class Chilopoda, while silverfish are insects in the class Insecta.
Distinct Classifications
- Centipedes are Myriapods: The term “Myriapoda” means “many feet.” Unlike insects, centipedes have a long, multi-segmented body with one pair of legs per segment. Because they have significantly more than six legs, they are not insects; they are more closely related to millipedes.
- Silverfish are Insects: To be classified as an insect, an animal must have three distinct body sections (head, thorax, and abdomen) and exactly six legs. Silverfish meet all these criteria, making them true insects.
In short: A centipede is a myriapod, and a silverfish is an insect.
Physical Appearance
Size and Build
Centipedes vary greatly in size, ranging from 1 centimeter to over 30 centimeters in length for giant species. Most house centipedes weigh between 0.1 and 0.5 grams. Regardless of size, centipedes are long and thin with one pair of legs per body segment.
Silverfish are much smaller and flatter, usually measuring between 12 millimeters and 19 millimeters long. They weigh very little, often less than 0.01 grams. Their bodies are teardrop-shaped and stay very close to the ground. Silverfish have three long, thread-like appendages at their rear: two side appendages called cerci and one long central filament. These structures detect air currents and vibrations, helping the silverfish sense and escape predators in the dark.
Coloration and Markings
Centipedes are often yellowish-gray or dark brown in color. Some species display bright stripes or spots on their bodies. Silverfish have a shiny, metallic appearance due to their silvery scales. They do not have any distinct patterns or colorful markings.
Leg Count
Centipedes have between 15 and 177 pairs of legs depending on the species. Silverfish only have three pairs of legs located near their head.
Habitat & Range
Preferred Habitat
Centipedes thrive in dark, moist areas like basements or under rotting logs. Silverfish also thrive in dark, moist environments but prefer humid spots such as bathrooms, attics, and kitchens.
Geographical Range
Centipedes are found on every continent except for Antarctica. Silverfish are also found worldwide because they travel easily within human cargo.
Diet & Specialized Feeding Behaviors
Diet
Centipedes eat insects, spiders, and occasionally small vertebrates. They are nocturnal, strictly carnivorous, and hunt for their food. Silverfish consume paper, glue, clothing, and food crumbs. They are generalist scavengers that seek out carbohydrates and proteins.
Specialized Feeding Behaviors
Centipedes and silverfish have developed very different ways to find and process their food. These behaviors allow them to survive in areas where other bugs might starve.
The Centipede “Lasso”
Centipedes are high-speed hunters that often catch more than one meal at a time. They use a specialized “lasso” technique with their many long legs. A centipede can jump onto its prey and wrap its legs around the insect to pin it down. Remarkably, they can hold one bug with their rear legs while attacking another with their venomous claws. This allows them to clear out several pests in a single hunting session.
The Silverfish Enzyme
Silverfish can damage paper products, book bindings, and other materials containing starches or cellulose. Their ability to use these foods does not make them unique among animals.
Centipede vs Silverfish: Venomous vs Non-Venomous
Centipede
Centipedes are venomous, with people sometimes describing them as having “venomous front claws.” While centipedes do use front appendages to inject venom, scientifically they aren’t “claws” in the traditional sense. They are actually a pair of modified front legs located on the first body segment, just below the head.
These specialized appendages are called forcipules (or toxicognaths). Here is how they work:
- Pincer-like Function: They curve around the centipede’s head like a pair of tongs, allowing the centipede to “bite” and hold onto its prey.
- Venom Injection: The forcipules are hollow and connected to venom glands. When the centipede strikes, it pierces the exoskeleton of another insect and injects venom to paralyze or kill it.
- Defense and Hunting: While primarily used to catch food (like spiders or silverfish), they are also used as a defensive tool if the centipede feels threatened.
In terms of human safety, most house centipedes are not strong enough to pierce human skin. Larger species can, but their venom is generally compared to a bee or wasp sting—painful and irritating, but usually not dangerous unless a person has a specific allergy.
Silverfish
While they might look a bit intimidating with their quick, metallic movements and long “tails,” silverfish are harmless to humans and pets. They do not bite, and they are not known to carry any diseases.
Here are a few reasons why they are often confused with more dangerous pests:
- Speed: Their rapid, zig-zagging “swimming” motion can be startling.
- Appearance: Their three long tail-like appendages (cerci) can sometimes be mistaken for stingers.
- Centipede Confusion: Because they often share the same dark, damp habitats as the centipede, people often assume both are capable of biting.
The only real “danger” a silverfish poses is to human property. Since silverfish can digest cellulose, they are famous for eating their way through book bindings, wallpaper, silk, and starch-heavy pantry items.
Life Cycle & Lifespan
Life Cycle
Centipedes hatch from eggs and go through several molting stages. They may take several years to reach full maturity.
Silverfish undergo a simple metamorphosis from egg to nymph to adult. While most insects stop molting once they reach adulthood, Silverfish continue to shed their skin throughout their entire lives. This unique trait allows them to regrow lost limbs and live for many years.
Lifespan
Centipedes can live for up to six years in the wild or captivity. Silverfish live about three years in the wild but up to eight in stable environments.
Cultural Significance
Public opinion on centipedes varies widely: they are sometimes viewed as frightening pests and sometimes seen as symbols of good luck. Silverfish are mainly known as household nuisances that damage books and wallpaper.
Conservation Status
Conservation information varies among centipede species. Widespread household species should not be used to assign one conservation category to the entire group; some restricted-range species face habitat threats.
The household silverfish is widespread, but abundance alone is not evidence of a formal global conservation assessment.