Essential Facts About the Hacklemesh Weaver Spider

Hacklemesh Weaver spiders are fascinating creatures that may often be found around homes and buildings. These spiders, scientifically known as Amaurobiidae, are known for their distinct webs and unique behaviors. There’s a lot to discover about these intriguing arachnids, and this article aims to provide you with essential information about Hacklemesh Weavers.

These spiders can be commonly found in nesting habitats around properties, such as cracks and crevices on the exterior of buildings. To prevent them from entering your home, consider sealing gaps, installing tight-fitting door sweeps, and placing screens on windows. It is also helpful to minimize their food source by reducing insects in the area, using methods such as pest monitors or sticky traps 1.

In addition to their habitat preferences, Hacklemesh Weavers have fascinating lifecycles. For instance, male spiders overwinter as immatures, molt twice in spring, and become adults around April. After mating, they die. On the other hand, female spiders can be found during all seasons, suggesting they live for at least two years. These females lay their egg sacs in similar locations to where they’re found, often within their webs 2.

Hacklemesh Weaver Overview

Family Amaurobiidae

Hacklemesh weavers belong to the family Amaurobiidae. This family contains various species of spiders which share some common traits, including:

• Short, sturdy legs
• Oval, robust abdomen
• Dense, hackled hairs on the body

Genus and Species

The Hacklemesh weaver is scientifically named Amaurobius ferox. There are also other species within the Amaurobius genus, such as Amaurobius similis and Amaurobius fenestralis.

Taxonomic Hierarchy

Here is the classification of the Hacklemesh Weaver:

• Kingdom: Animalia
• Phylum: Arthropoda
• Class: Arachnida
• Order: Araneae
• Family: Amaurobiidae
• Genus: Amaurobius
• Species: Amaurobius ferox

The order Araneae classifies all spiders, while the class Arachnida includes other arthropods such as scorpions and ticks.

Comparison Table:

Common Name	Class	Order	Family	Genus	Species
Hacklemesh Weaver	Arachnida	Araneae	Amaurobiidae	Amaurobius	Amaurobius ferox
Common House Spider	Arachnida	Araneae	Theridiidae	Parasteatoda	Parasteatoda tepidariorum

The Hacklemesh Weaver shares the same class, order, and family with many other spiders. However, its genus and species set it apart from other common spiders like the Common House Spider.

Physical Characteristics

Color and Size

Hacklemesh weavers are generally small to medium-sized spiders. They typically have a tan-colored abdomen and gray cephalothorax, which may sometimes appear with a pinkish flesh color. Here are some features of their appearance:

• Tan abdomen
• Gray cephalothorax
• Sometimes pinkish flesh color

Male vs Female

When comparing male and female hacklemesh weavers, there are some differences in size and appearance. To give you an idea, let’s look at a comparison table:

Feature	Male	Female
Size	Smaller	Larger
Abdomen	Narrower	Wider
Legs	Longer and thinner	Shorter and thicker

For example, male hacklemesh weavers typically have longer and thinner legs compared to the females. Apart from these differences, both male and female spiders share the same colors and general appearance.

Habitat and Range

Geographical Locations

Hacklemesh weavers are found throughout various regions in North America, spanning from California to the southern and eastern United States, such as Louisiana, Texas, Alabama, Florida, Georgia, South Carolina, and North Carolina¹². They can also be seen in some parts of Canada¹.

Natural Environment

These spiders prefer environments with:

• Rocks
• Leaf litter
• Stones
• Woodpiles
• Logs
• Tree bark²

They can be found in habitats like:

• Grasslands
• Forests, both in high foliage and ground layer
• Under rocks or debris¹²

Urban Environment

Interestingly, Hacklemesh weavers have also adapted to urban environments, where they can be found nesting in:

• Basements, particularly damp basements²
• Man-made structures²

In the spring months of April and May, these spiders are more likely to be seen as they venture out in search of mates¹.

Pros of urban environments:

• Abundance of insects
• Shelter from predators

Cons of urban environments:

• Human disturbance
• Limited natural hiding spaces

Comparison table of natural vs. urban environments:

Environment	Examples of suitable spots	Pros	Cons
Natural	Rocks, leaf litter, woodpiles	Natural hiding spaces	More predators
Urban	Basements, man-made structures	Abundance of insects	Human disturbance

Behavior and Lifestyle

Diet and Prey

Hacklemesh weavers (Amaurobius species) are carnivorous spiders that mainly feed on small insects. Some typical examples of their prey include:

• Flies
• Mosquitoes
• Moths

These spiders use their chelicerae, or fangs, to inject venom and immobilize their prey.

Weaving Webs

Hacklemesh weavers belong to the group of cribellate spiders, which means they produce a unique type of web. These webs can be best described as a tangled nest, consisting of:

• Irregular strings of silk
• A tube retreat for the spider to hide

The tube retreat, typically found at the edge of their webs, offers the spider a secure hiding spot.

Mating Habits

The mating habits of hacklemesh weaver spiders are specific. Key points in their mating process include:

• Males molt twice after overwintering
• Males die after mating
• Females can live for at least two years
• Females lay egg sacs in the same location as their webs source

In summary, the behavior and lifestyle of hacklemesh weaver spiders revolve around their diet, web weaving, and mating habits. Their existence in diverse environments and unique techniques in searching for prey make them fascinating creatures to study.

Venom and Bites

Comparison to Other Spiders

Hacklemesh weaver spiders (Callobius sp.) are generally not venomous. They pose a low risk compared to other dangerous spiders like the brown recluse (Loxosceles reclusa).

Comparison table:

Spider	Venomous	Pain Level	Seriousness
Hacklemesh Weaver	No	Low	Low Risk
Brown Recluse	Yes	High	High Risk

Pros of Hacklemesh Weaver:

• Non-threatening to humans
• Low-risk bites

Cons of Hacklemesh Weaver:

• May cause mild irritation

Symptoms and Effects

In the rare cases where a hacklemesh weaver spider bites, the symptoms and effects are usually mild. A bite might lead to:

• Localized pain
• Redness
• Swelling

These side effects should subside on their own, but if you notice severe symptoms like nausea or difficulty breathing, seeking medical help is essential. Keep in mind that these severe symptoms are usually not associated with hacklemesh weaver bites.

Other Interesting Facts

Similar Species

• Hacklemesh weavers (Amaurobiidae) can be compared to some other spider species like the Metaltella simoni and the Southern house spider (Kukulcania hibernalis).
• These spiders share some physical similarities, but with noticeable differences:
  • Hacklemesh weavers have a tan, brown, or grayish coloration, while Metaltella simoni usually displays darker shades and Southern house spiders have a dark brown or black color.
  • Hacklemesh weavers are typically found in North America, while Metaltella simoni and Southern house spiders have a more expansive geographic range.

Feature	Hacklemesh Weaver	Metaltella Simoni	Southern House Spider
Color	Tan, Brown, or Gray	Darker Shades	Dark Brown or Black
Geographic Range	North America	Wider Range	Wider Range

Scientific Classification

• The scientific classification for Hacklemesh weavers is as follows:
  • Kingdom: Animalia
  • Phylum: Arthropoda
  • Class: Arachnida
  • Order: Araneae
  • Suborder: Araneomorphae
  • Family: Amaurobiidae

On a final note, Hacklemesh weavers’ common name, “night spiders,” comes from their nocturnal habits. They are not harmful to humans and contribute to controlling insect populations.

Footnotes

1. Hacklemesh Weaver Spiders – Penn State Extension ↩ ↩² ↩³ ↩⁴
2. Hacklemesh Weaver Spiders – School IPM – USU Extension ↩ ↩² ↩³ ↩⁴ ↩⁵