Have you ever spotted a red spider in your home? It might be the red house spider! They’re often found chilling in cool spots or near doorframes. And yes, they’re really red!
Size: Females are 0.20-0.33 in (excluding the legs) and males are typically smaller.
Color: The body is essentially red with shades of orange or brown in some individuals.
Other Characteristic Features: The globe-shaped abdomen in female spiders has a red marking, similar to the black widow spider’s abdomen.
Eggs
Eggs are laid on a round sac attached near to the web.
Spiderlings
The juvenile state has not been observed so far.
The Web
Not much is known except the tangled web is extremely messy and the spider is protective of it.
Are Red House Spiders Venomous?
Yes, Red House Spiders are venomous, but their venom is mainly used to catch tiny bugs for food.
Can Red House Spiders Bite?
Yes, Red House Spiders can bite. While they’re usually busy with their bug snacks, they might give a small bite if they’re startled or feel trapped. Most of the time, it’s just a tiny nip.
Ecological Importance and Behavior of Red House Spider
As insectivores, Red House Spiders play a role in controlling pest populations within their habitats. Their presence in homes and gardens can be beneficial, reducing the number of house flies, beetles, and ants.
Natural Predators: In the wild, these spiders face predation from a variety of larger arthropods, birds, and mammals. These predators help maintain a natural balance, ensuring that Red House Spider populations do not grow excessively.
Prey-Predator Dynamics: The Red House Spider’s role in the food web is significant. Their predation helps control insect populations, which in turn affects the distribution and abundance of their predators, maintaining the balance within their ecosystem.
Relationship with Humans: Typically harmless to humans, Red House Spiders may bite if provoked but their venom is not considered dangerous and usually results in nothing more than minor discomfort. They are often unobtrusive residents in homes, contributing to insect management.
Quick Facts
Distribution
United States (California, Texas, and Florida) and Australia
Habitat
Inside the house, around the garden
Diet
House flies, larder beetles, and ants
Lifespan
Not observed
IUCN Conservation Status
Not listed
Did You Know
It is often confused with the black widow spider because of its abdomen.
In conclusion, the Red House Spider is an understudied yet ecologically important species that contributes to the management of insect populations within human environments.
A red house spider has a reddish-orange or brown body with a distinctively globe-shaped abdomen. Females, which are larger than males, often feature a red marking on their abdomen similar to that of a black widow. Their body length typically ranges from 0.20 to 0.33 inches, excluding legs.
Adult female red house spiders typically measure between 0.20 to 0.33 inches in body length, not including their legs. Males of the species are characteristically smaller than the females. Their compact size allows them to remain relatively inconspicuous in homes despite their often bright red or orange coloration.
Yes, red house spiders are venomous, but their venom is not considered medically significant to humans. They primarily use their venom to subdue small insect prey like flies and ants. A bite from this spider is unlikely to cause a serious reaction in a person beyond minor, localized irritation.
Red house spiders are commonly found in cool, undisturbed areas within a home. You can often spot their messy, tangled webs in corners, near doorframes, or in basements and garages. They prefer locations where they can remain hidden while effectively catching insects that wander into their territory.
Red house spiders are insectivores that primarily eat small household pests they capture in their webs. Their diet commonly includes house flies, small beetles, ants, and other tiny arthropods. By preying on these insects, they can play a beneficial role in controlling pest populations within a home environment.
Yes, a red house spider can bite, but this behavior is uncommon and typically occurs only in self-defense. A bite might happen if the spider is startled or feels trapped against a person’s skin. The bite itself is generally considered minor and is not a cause for serious concern.
A female red house spider lays her eggs inside a round, silken sac. This egg sac is then attached securely within or near her messy, tangled web. The spider remains protective of its web and the attached egg sac, guarding it against potential threats and predators until the spiderlings hatch.
Dr. James Watuwa on January 12, 2019.
Spider Team
