- Kingdom: Animalia
- Phylum: Arthropoda
- Class: Arachnida
- Order: Araneae
- Suborder: Araneomorphae
- Family: Eutichuridae
- 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
Disclaimer: The following table provides a quick overview of the spider's basic attributes. The physical traits are greatly generalized in order to aid in the identification and sorting of spider species using our search feature. This information is not exhaustive, and keep in mind that traits such as color, markings, and overall size and shape can vary widely within a species due to variables such as the spider's age, gender, diet, hydration level, climate, and habitat. Though experienced arachnologists and hobbyists can often classify spiders rather accurately based on their unique markings and general appearance, it's important to know that scientifically accurate spider identification relies on detailed taxonomic keys and microscopic examinations of a spider's reproductive organs.
|Body size||7mm - 10mm||5mm - 9mm|
|Eye count||8||Primary Colors|
|Identifying Traits||Patternless, Legs solid color, Especially long legs|
|Web style||Retreat or silken sac|
- 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.