- Kingdom: Animalia
- Phylum: Arthropoda
- Class: Arachnida
- Order: Araneae
- Suborder: Araneomorphae
- Family: Agelenidae
- Genus: Eratigena
- Species: Eratigena atrica
Common Name (AAS)
Giant House Spider
Other Common Names
Drain Spider, Greater European House Spider
Carl Ludwig Koch, 1843
There have been 35 confirmed sightings of Eratigena atrica (Giant House Spider), with the most recent sighting submitted on January 13, 2019 by Spider ID member j_isaac906. The detailed statistics below may not utilize the complete dataset of 35 sightings because of certain Eratigena atrica sightings reporting incomplete data.
- Web: 14% of the time, Eratigena atrica spiders are sighted in a spider web (Sample size: 14)
- Sex: 11 female and 10 male.
- Environment: Eratigena atrica has been sighted 5 times outdoors, and 11 times indoors.
- Outdoors: Man-made structure (3). Ground layer (1). Under rock or debris (1).
Location and Range
Eratigena atrica (Giant House Spider) has been sighted in the following countries: Canada, France, Lithuania, Switzerland, United Kingdom, United States.
Eratigena atrica has also been sighted in the following states: Michigan, Oregon, Washington.
Eratigena atrica has been primarily sighted during the month of September.
- January: 2
- February: 2
- March: 4
- April: 6
- July: 5
- August: 6
- September: 6
- October: 2
- December: 1
- Can be mistaken for the “hobo spider” (Eratigena agrestis) or the “barn funnel weaver” (Tegenaria domestica), but are actually quite different when seen by an experienced eye.
- Leg span can be very large; some of the largest ones reach about 4 inches.
- Often found in bathtubs or showers first thing in the morning (or in the middle of the night) as it seeks out sources of water and may become stuck: able to get in, but not able to climb out.
- With speeds clocked at 1.73 ft/sec (1.17 mph), this spider held the Guinness Book of World Records for top spider speed until 1987 when it was displaced by “windscorpions” (solpugids).
- Species is often found living indoors, where it out-competes and displaces the “hobo spider,” helping to keep them from becoming established indoors. Male “giant house spiders” have even been witnessed killing male “hobo spiders” without necessarily eating them.