Cat Faced Spider Uncovered: Essential Information Simplified

The Cat Face Spider (Araneus gemmoides) is a fascinating species of spider belonging to the orb weaver family Araneidae.

Commonly found in the western parts of North America, these spiders are easily identifiable by their unique appearance, which features two “horns” on the sides of their abdomen, resembling a cat’s face.

As orb weavers, Cat Face Spiders are known for constructing intricate, circular webs to catch their prey.

Despite their somewhat intimidating appearance, Cat Face Spiders are actually quite harmless to humans.

In fact, they provide a valuable service by helping control insect populations in gardens and around homes.

Adult female Cat Face Spiders are generally larger than the males, and their color can range from a light yellow-brown to a dark reddish-brown.

Males are much smaller and typically have a more slender body shape, making them less often noticed.

Cat Faced Spider Identification

Physical Appearance

Cat faced spiders are orb-weaver spiders with unique features that resemble a cat’s face.

Their scientific name is Araneus gemmoides and they are commonly found throughout North America.

Features to note:

• Cat ears: The distinct “cat ears” are actually bumps or dimples on the abdomen.
• Shape: The overall shape of the spider is round and smooth.

Color and Patterns

The coloration of cat faced spiders varies, but there are certain patterns that can aid in identification:

• Colors: They can be found in shades of brown, yellow, and even a dark form¹.
• Patterns: The abdomen often features lighter, mottled patterns, while the presence of cat ears gives them their name.

Size and Sexual Dimorphism

Cat faced spiders exhibit sexual dimorphism, meaning that males and females differ in size and appearance².

• Females: The large full-grown females vary from about 13mm to 25mm long and 4.5-5.5 mm wide¹.
• Males: Males are significantly smaller in size (between 5mm and 8mm)¹.

In comparison with the closely related brown recluse spider, cat faced spiders have a different eye pattern, with their eyes arranged in two rows of four³.

Here’s a comparison with the brown recluse spider 

By knowing its physical appearance, color patterns, and size differences between males and females, it becomes easier to identify a cat faced spider in the wild.

Habitat and Distribution

Geographical Range

Cat Faced Spiders are native to North America, primarily found in the USA and stretching into Canada.

Their range spans multiple states, including Arizona, Colorado, Michigan, California, and Missouri.

These spiders can also be found in parts of British Columbia.

Preferred Living Spaces

The preferred living spaces for Cat Faced Spiders include:

• Animal burrows: They often take shelter in animal burrows to stay protected.
• Garden vegetation: These spiders reside among plants, bushes, and trees, as they provide coverage and support for their webs.

Migration and Population

Cat Faced Spiders experience population growth during late summer, when mating occurs.

Males move about in search of receptive females, while females store sperm for later egg fertilization.

After laying eggs, the females die, making late summer the peak of their population.

Diet and Hunting Techniques

Feeding Habits

The Cat Faced Spider primarily feeds on a variety of garden insects, including:

• Flies: They enjoy feeding on house flies and other flying insects.
• Mosquitoes: These spiders can help control mosquito populations in your garden.
• Other small insects: These can vary depending on the spider’s habitat.

Preying Techniques

Cat Faced Spiders employ both of the below strategies to catch their prey:

• Web Construction: They build orb-shaped webs that aid in trapping various flying insects.
• Ambush: They wait patiently for an unsuspecting insect to fly into their web.

A comparison of Cat Faced Spider’s diet and hunting techniques with those of other common garden spiders:

The Cat Faced Spider is a beneficial addition to your garden, as they feed on common pests and help maintain a balanced ecosystem.

Behavior and Life Cycle

Mating and Reproduction

Mating in this species occurs in late summer, as smaller males actively search for receptive females.

Once mated, females store the sperm until they lay their eggs.

Source: Judy Gallagher, CC BY 2.0, via Wikimedia Commons

Egg Sacs and Spiderlings

After mating, the female Cat Faced Spider produces a silk egg sac containing her eggs.

The egg sacs are often deposited in a safe location near their web, providing protection for the soon-to-be spiderlings.

Once hatched, the young spiders leave the egg sac and disperse.

Egg Sac Features:

• Silk-based structure
• Protection for eggs
• Located near the web

Lifespan and Growth

These spiders grow and develop throughout the spring, reaching maturity by late summer.

As members of the class Arachnida, the Cat Faced Spider undergoes a series of molts, shedding its exoskeleton as it outgrows it.

However, their exact lifespan varies depending on factors such as predation and environmental conditions.

Activity Patterns

Being nocturnal spiders, Cat Faced Spiders are most active during the night, when they build their orb-like webs to capture prey, such as flies and other small insects.

During the day, these spiders remain relatively inactive, hiding in crevices or near their webs.

The Cat Faced Spider is generally harmless to humans and can be found living near or on buildings.

Cat Faced Spider and Its Relationship with Other Species

Predators and Threats

The Cat Faced Spider (Araneus gemmoides) is an orb-weaver spider commonly found in gardens and around homes across the USA.

This arachnid encounters various predators in its natural habitat, such as:

• Wasps: Some wasp species, particularly mud daubers, actively hunt spiders. They paralyze them and store them in their nests as a food source for their larvae.
• Animals: Threats also include animals that inadvertently stumble upon and crush spiderlings in their burrows.

Role in the Ecosystem

As a member of the arachnid family, the Cat Faced Spider plays a significant role in maintaining the balance of their ecosystem. Some of their contributions include:

• Preying on insects: By feeding on various insects, they help control pest populations in gardens and other habitats.
• Providing food for other species: The spiders themselves are a source of food for their natural predators, such as wasps and some larger animals.

Interaction with Humans and Pets

Cat Faced Spiders generally do not pose a significant threat to humans or pets, as they are not known to be highly venomous.

However, they can bite when provoked or threatened. In most cases, a bite from a Cat Faced Spider will cause minor pain or irritation and is comparable to that of a bee sting. It’s essential to:

• Exercise caution: When working in gardens or areas inhabited by these spiders, be mindful of their presence to avoid accidental contact.
• Keep pets supervised: Monitor pets in outdoor spaces where the spiders might be present to prevent them from disturbing the arachnids.

Conclusion

The Cat Faced Spider, a unique orb-weaving spider, is a captivating creature native to North America.

Its distinguishing “cat ears” on the abdomen, beneficial pest control role in gardens, and harmless nature towards humans make it an intriguing species.

Although its interaction with other spiders and exact range are areas for further exploration, understanding its habits, appearance, and contribution to ecosystem balance is crucial for both arachnophiles and garden enthusiasts.

Through continued research, we can uncover more about this spider and its place in the entomological world.

Footnotes