- Kingdom: Animalia
- Phylum: Arthropoda
- Class: Arachnida
- Order: Araneae
- Suborder: Araneomorphae
- Family: Cheiracanthiidae
- Genus: Cheiracanthium
- Species: Cheiracanthium mildei
Common Name (AAS)
Long-legged Sac Spider
Other Common Names
Sac Spider, Yellow Sac Spider, Black-footed Spider, Prowling Spider, Slender Sac Spider, Yellow House Spider
Ludwig Carl Christian Koch, 1864
There have been 110 confirmed sightings of Cheiracanthium mildei (Long-legged Sac Spider), with the most recent sighting submitted on April 22, 2019 by Spider ID member bwarner. The detailed statistics below may not utilize the complete dataset of 110 sightings because of certain Cheiracanthium mildei sightings reporting incomplete data.
- Web: 15% of the time, Cheiracanthium mildei spiders are sighted in a spider web (Sample size: 95)
- Sex: 6 female and 37 male.
- Environment: Cheiracanthium mildei has been sighted 3 times outdoors, and 92 times indoors.
- Outdoors: Man-made structure (3).
Location and Range
Cheiracanthium mildei (Long-legged Sac Spider) has been sighted in the following countries: Canada, Czech Republic, Italy, United States.
Cheiracanthium mildei has also been sighted in the following states: California, Colorado, Connecticut, Idaho, Illinois, Indiana, Kansas, Maine, Maryland, Massachusetts, Michigan, Minnesota, Missouri, Nebraska, New Hampshire, New Jersey, New York, Ohio, Oregon, Pennsylvania, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin.
Cheiracanthium mildei has been primarily sighted during the month of May.
- January: 11
- February: 4
- March: 12
- April: 20
- May: 40
- June: 7
- July: 2
- August: 1
- September: 2
- October: 7
- December: 2
- General appearance almost the same as in the native species Cheiracanthium inclusum; the two should be separated only by microscope exam.
- Historically, this spider has been implicated in necrotic bites, however, recent research has exonerated the species as a cause of necrotic wounds.
- Cheiracanthium spiders are sometimes mistaken for brown recluses (Loxosceles reclusa) inside homes.
- Typically most common inside homes and buildings, while our native North American species, Cheiracanthium inclusum, is found more often outdoors in fields and foliage.
- The female usually encloses herself inside her egg sac and stands guard over the eggs until the spiderlings emerge.
- Females probably mate only once, but they can create up to 5 egg sacs in their lifetime.
- In March 2011, Mazda recalled approximately 50,000 cars (Mazda6) because this species of spider was building its retreats inside of fuel lines. At least that was the publicly-disclosed explanation.