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Woodlouse Spiders

Woodlouse Spiders

What Are Woodlouse Spiders?

Dysdera spp., are a group of arachnids belonging to the family Dysderidae. These spiders are primarily known for their unique feeding habits, which involve preying on woodlice, also known as sowbugs or pillbugs. Here is an overview of woodlouse spiders:

  • Taxonomy and Classification: Woodlouse spiders belong to the family Dysderidae within the order Araneae, which encompasses all spiders. They are part of the suborder Araneomorphae, which includes a vast diversity of spider species.
  • Physical Characteristics: Woodlouse spiders typically exhibit a robust and flattened body, ranging in size from 4 to 10 mm. They are usually reddish-brown or dark brown in color, and their chelicerae (fangs) are well-developed for capturing and feeding on woodlice.
  • Habitat: These spiders are predominantly found in Europe, although they have been identified in other regions as well. They are often discovered in moist and dark environments, such as under logs, rocks, and in leaf litter, where woodlice are abundant.
  • Feeding Behavior: Woodlouse spiders are specialized predators of woodlice, which are crustaceans. They have adapted to their prey by having strong, chitinous fangs capable of piercing the hard exoskeleton of woodlice. The venom injected helps break down the internal tissues of the woodlice, allowing the spider to feed on the softened prey. Their hunting strategy often involves ambushing woodlice in their hiding places.
  • Reproduction: These spiders reproduce sexually, with females laying a small number of eggs in a silken sac. After hatching, the spiderlings undergo several molts before reaching maturity.
  • Conservation Status: Woodlouse spiders are not generally considered endangered or threatened. They are not a species of significant conservation concern, likely due to their adaptability and wide distribution.
  • Significance: While woodlouse spiders are not as well-known as some other arachnid species, they play a vital role in controlling woodlice populations. In ecological terms, they help maintain the balance of arthropod populations in their habitats.

Woodlouse spiders are a unique and ecologically important group of arachnids known for their specialization in preying on woodlice. They are adapted to their specific ecological niche, with features and behaviors that allow them to capture and feed

What Do Woodlouse Spiders Look Like?

Woodlouse spiders (Dysdera spp.) are distinctive in their appearance, with several notable physical characteristics. Here is a description of what woodlouse spiders look like:

  • Size: Woodlouse spiders are relatively small, typically ranging from 4 to 10 millimeters in body length, with some variations among different species and individuals.
  • Body Shape: They have a robust, flattened body shape, which is somewhat reminiscent of a crab. This flattened body helps them access the tight spaces where woodlice, their primary prey, often hide.
  • Coloration: Woodlouse spiders are commonly reddish-brown or dark brown in color. This coloration helps them blend into their natural habitat, which is often composed of decaying plant matter, soil, and rocks.
  • Chelicerae (Fangs): One of the most distinctive features of woodlouse spiders is their powerful and well-developed chelicerae, or fangs. These fangs are relatively large in proportion to their body size and are adapted for piercing the hard exoskeleton of woodlice.
  • Eyes: They typically have six eyes arranged in a specific pattern. Two large, central eyes are situated at the front, while two pairs of smaller lateral eyes are located to the sides of the larger ones.
  • Legs: Woodlouse spiders have eight long, relatively slender legs covered in fine hairs. These legs are adapted for both movement and capturing prey. The spiders use their legs to grasp and immobilize woodlice.
  • Palps: The pedipalps, which are the two short appendages located near the mouth, are used for manipulating prey and transferring sperm during mating.
  • Abdomen: The abdomen of woodlouse spiders is typically oval or rounded in shape and may have some fine hairs or spines, but they are not densely covered.
  • Spinnerets: At the rear of the abdomen, these spiders have spinnerets, which are used to produce silk for building retreats and egg sacs.

Woodlouse spiders are characterized by their flattened, crab-like body shape, reddish-brown to dark brown coloration, prominent chelicerae, and a specific eye arrangement. These physical features, combined with their specialized adaptations for capturing and feeding on woodlice, make them easily distinguishable from other spider species.

Where Are Woodlouse Spiders Found?

Woodlouse spiders (Dysdera spp.) are typically found in specific habitats that provide them with access to their primary prey, woodlice. Here is a description of where you might find woodlouse spiders:

  • Dark and Moist Environments: Woodlouse spiders prefer habitats that are dark and moist. They are often found in areas with high humidity levels.
  • Under Rocks and Logs: Woodlouse spiders frequently hide beneath rocks, logs, and other debris on the forest floor. These locations offer shelter and access to woodlice, which also tend to congregate in such places.
  • Leaf Litter: Leaf litter in woodlands and gardens is another favored habitat. Woodlice hide under fallen leaves, providing a consistent source of prey for the spiders.
  • Mulch and Compost: Gardens and compost piles can be home to woodlouse spiders, as they can find both shelter and ample woodlice in these organic environments.
  • Wooded Areas: Woodlouse spiders are commonly associated with wooded or forested regions. These areas provide a rich supply of woodlice and the dark, humid conditions they prefer.
  • Stone Walls and Crevices: In some cases, you might find woodlouse spiders dwelling in the gaps and crevices of stone walls, as these spaces can offer both shelter and woodlice as a food source.
  • Residential Areas: Woodlouse spiders can occasionally be found in gardens, especially in mulched flower beds, under plant pots, or in damp areas around the home. They might also seek refuge in basements or other dark, damp parts of buildings.

Woodlouse spiders are not aggressive towards humans and are generally non-venomous to humans. Their primary interest is capturing and feeding on woodlice. If you are interested in observing or studying woodlouse spiders in their natural habitat, exploring wooded areas, flipping rocks and logs, or inspecting leaf litter are excellent ways to find them. Always handle them with care and consider releasing them back into their environment after observation.

What Is The Life Cycle Of Woodlouse Spiders?

The life cycle of woodlouse spiders (Dysdera spp.) follows a typical arachnid pattern, consisting of several stages from hatching to maturity. Here's an overview of the life cycle of woodlouse spiders:

Egg Stage:

  • The life cycle begins when a female woodlouse spider lays a relatively small number of eggs (typically around a dozen) in a silken egg sac. The eggs are deposited in a sheltered location, such as under a rock or in a crevice, to protect them from predators and environmental conditions.

Spiderling Stage:

  • After an incubation period that can vary depending on environmental factors like temperature and humidity, the spiderlings hatch from the eggs. They emerge as small, miniature versions of adult spiders.
  • Spiderlings are vulnerable at this stage and need to disperse to find suitable prey and hiding places to grow and molt.


  • As they grow, spiderlings undergo a series of molts, shedding their exoskeleton to accommodate their increasing size. Molting allows them to develop and mature.
  • The number of molts and the time it takes to reach maturity can vary among species and environmental conditions.


  • As they continue to molt and grow, spiderlings gradually develop the distinctive features of adult woodlouse spiders, including their flattened body shape, specialized fangs, and coloration.
  • The time it takes for a spiderling to reach maturity and become an adult can range from several months to a couple of years, depending on the species and environmental factors.


  • Once they have reached maturity, male and female woodlouse spiders become sexually active. Mating occurs when a receptive female encounters a mature male. Males use their pedipalps to transfer sperm to the female.
  • After mating, the female may lay eggs in one or more silk egg sacs, which she then protects and guards until they hatch.

The life cycle of woodlouse spiders is closely tied to the availability of their primary prey, woodlice, and the environmental conditions in their habitat. In general, these spiders exhibit relatively short life spans, with the duration of each life stage varying depending on factors like temperature, humidity, and food availability. Their life cycle is adapted to their ecological niche and the seasonal availability of woodlice, upon which they primarily feed.

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Are Woodlouse Spiders Dangerous?

Woodlouse spiders (Dysdera spp.) are not considered dangerous to humans. These spiders have specific adaptations for preying on woodlice and are not aggressive toward people. Here's why woodlouse spiders are not considered a threat:

  • Venom: While woodlouse spiders possess venom to immobilize their primary prey, woodlice, their venom is not dangerous to humans. Their venom is adapted for breaking down the internal tissues of woodlice, which have a completely different physiology from humans.
  • Bite Incidents: Woodlouse spiders are rarely encountered by people and are not known for biting humans. Even in cases where a bite might occur, the effects are typically mild and localized, similar to a bee or wasp sting. Any discomfort or minor symptoms that may result from a woodlouse spider bite are usually short-lived and do not require medical attention.
  • Non-Aggressive Behavior: Woodlouse spiders are generally non-aggressive and do not seek out human contact. They are more interested in capturing and feeding on woodlice in their natural habitats, such as under rocks, logs, and in leaf litter.
  • Ecological Role: These spiders play a beneficial ecological role in controlling woodlice populations. Woodlice are important decomposers in ecosystems, and woodlouse spiders help maintain the balance of arthropod populations.

Woodlouse spiders are not dangerous to humans and are unlikely to pose any health risk. They are best left undisturbed in their natural habitat, where they play a valuable role in the ecosystem by helping control woodlice populations and contributing to the balance of arthropod communities.

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Frequently Asked Questions About Woodlouse Spiders

Why do I have a woodlouse spider problem?

Woodlouse spiders, also known as Dysdera crocata, are a common type of spider found throughout the world, including in North America. These spiders are known for their tendency to live in damp environments and their preference for feeding on woodlice or pillbugs, which are common pests found in many homes.

If you are experiencing a woodlouse spider infestation, it is likely that your home or property provides the ideal habitat for these spiders. Some of the most common reasons why woodlouse spiders may be attracted to your property include:

  1. Moisture: Woodlouse spiders thrive in damp environments, so if your home or property has areas that are consistently damp, such as a basement or crawl space, this could be an ideal habitat for these spiders.
  2. Pests: As mentioned earlier, woodlouse spiders primarily feed on woodlice or pillbugs, so if your property has a high population of these pests, it is likely that you will also have woodlouse spiders.
  3. Clutter: Woodlouse spiders tend to prefer areas that are cluttered or have lots of debris, as these environments provide ample hiding places and protection from predators.
  4. Landscaping: If your property has lots of leaf litter or other debris on the ground, this could also be a factor in attracting woodlouse spiders, as these spiders often prefer to hide in such environments.
  5. Structural issues: If your property has cracks or other structural issues that provide easy access

How do I get rid of woodlouse spiders?

While woodlouse spiders are not harmful to humans and are often considered beneficial, some people may wish to get rid of them from their homes or gardens. Here are some of the best ways to get rid of woodlouse spiders:

  • Reduce moisture levels: Woodlouse spiders prefer dark, damp environments, so reducing moisture levels in your home or garden can make these areas less appealing to them. You can use a dehumidifier to reduce humidity levels in basements and crawl spaces, and fix any leaks or standing water sources that may be contributing to high moisture levels. You can also improve ventilation in these areas by opening windows or installing a fan.
  • Eliminate woodlice: Woodlouse spiders feed on woodlice, so reducing woodlouse populations can help reduce the number of spiders. You can remove any sources of decaying organic matter, such as piles of leaves or wood, that may be attracting woodlice to your home or garden. You can also seal any cracks or crevices in your home or garden where woodlice may be hiding.
  • Clean regularly: Regular cleaning can help keep woodlouse spiders at bay. Be sure to vacuum or sweep up any webs, debris, or food particles that may attract the spiders. Also, try to keep clutter to a minimum, as this can provide hiding places for spiders.
  • Vacuuming: Vacuuming can be an effective way to get rid of woodlouse spiders, especially when combined with other methods. Use a vacuum cleaner with a crevice tool or brush attachment to reach into tight spaces where the spiders may be hiding. Be sure to dispose of the vacuum bag or canister outside of your home to prevent the spiders from returning.
  • Physical removal: You can also physically remove woodlouse spiders by using a jar or cup and a piece of paper. Simply place the jar or cup over the spider and slide the paper underneath, trapping the spider inside. You can then release the spider outside, away from your home. This method is safe and humane, but it may not be practical for large infestations.
  • Use sticky traps: Sticky traps are an effective way to catch and remove woodlouse spiders from your home or garden. These traps consist of a sticky surface that traps the spiders when they walk over it. You can place these traps in areas where the spiders are commonly found, such as basements or crawl spaces. Once the traps are full, you can dispose of them in the trash.
  • Use natural repellents: Some natural repellents may be effective at repelling woodlouse spiders. For example, you can spray peppermint oil or vinegar in areas where the spiders are commonly found. These substances have a strong odor that spiders may find unpleasant. You can also try planting certain herbs, such as lavender or rosemary, which may repel spiders.
  • Use insecticides: Insecticides should be used as a last resort, as they can be harmful to humans and other animals if not used properly. If you decide to use an insecticide, it is important to choose one that is labeled for use against spiders, and to follow the instructions carefully. You should also avoid using insecticides in areas where children or pets may come into contact with them.
  • Seek professional help: If you are unable to get rid of woodlouse spiders on your own, or if you have a severe infestation, it may be necessary to seek the help of a professional pest control company. A professional can assess the situation and recommend the best course of action, which may include using more advanced techniques, such as fumigation or exclusion methods.
  • Use ultrasonic repellents: Ultrasonic repellents emit high-frequency sound waves that are designed to repel spiders and other pests. These devices are typically plugged into an electrical outlet and can be placed in areas where the spiders are commonly found. However, their effectiveness is still debatable and they may not work for everyone. Also, it is important to note that some people may find the noise irritating.

It is important to choose a method that is safe and effective, and to take steps to prevent future infestations.

How can I prevent woodlouse spiders in the future?

If you want to prevent woodlouse spiders in the future, there are several steps you can take:

  1. Keep your landscaping well-maintained: Woodlouse spiders are often found in outdoor environments, so keeping your landscaping well-maintained can help to prevent these spiders. Remove any piles of debris, keep your lawn mowed, and trim back bushes and shrubs.
  2. Reduce moisture: Woodlouse spiders thrive in damp environments, so reducing moisture in and around your home is an important step in preventing these spiders. Fix any leaky pipes, keep gutters and downspouts clear, and use a dehumidifier in areas with high humidity levels.
  3. Seal cracks and gaps: Woodlouse spiders can enter your home through cracks and gaps in walls, floors, and other surfaces. Seal these gaps with caulk or other sealant to prevent spiders from entering.
  4. Remove clutter: Woodlouse spiders prefer cluttered environments with lots of hiding places, so removing clutter in and around your home can help to prevent these spiders. Keep your home clean and organized, and remove any piles of debris or clutter from your yard.
  5. Use spider repellents: There are several natural spider repellents that you can use to deter woodlouse spiders from your home. These include peppermint oil, vinegar, and citrus peels. You can also purchase commercial spider repellents to use in and around your home.
  6. Pest control: Since woodlouse spiders feed on woodlice and pillbugs, controlling these pests can help to prevent a woodlouse spider infestation. Use insecticides or other pest control methods to reduce the population of these pests in and around your home.

By taking these steps, you can help to prevent woodlouse spiders from taking up residence in your home or property. However, if you do have a woodlouse spider infestation, it's a good idea to contact a pest control professional for assistance. They can help to identify the source of the infestation and recommend appropriate treatments to eliminate the problem.

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