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Black Widow (Latrodectus mactans)

Detailing the physical features, habits, territorial reach and other identifying qualities of the Black Widow

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Sighting the small red hourglass shape on the belly of the glossy Black Widow calls for immediate caution and a plan of action.

Updated: 01/05/2022; Authored By Staff Writer; Content ©www.InsectIdentification.org
Female Black Widows are famous for their toxic venom. Males lack toxicity and are not really known to bite. Immature females do not yet have the powerful poison stores that adults develop. The bodies of both genders are shiny and hairless. Juveniles start out brown, white and orange, growing more black as they age. Adult females are glossy and completely black with the trademark red 'hourglass' on the bottom of their round abdomen. Though males change in color and pattern as they mature, they are always smaller in size (by half) compared to the female. Females are known to eat the male after mating, earning them the name 'widow'. Females can store the sperm from one mating session and use it to produce subsequent batches of fertilized eggs. Lifespans for females range from one to three years; males may live about two months.

Found frequently in the southern U.S. states, this species is also called the Southern Black Widow. It tends to spin its web in places that may be disturbed or visited by humans, thus increasing the likelihood of an unfortunate encounter between them. Webs are irregular in shape, but strong, and are built under stones, near openings of rodent holes, and in outbuildings such as sheds, outhouses or barns. The spider is unlikely to leave its web to hide from insect prey. It does not go out of its way to bite humans, but a female guarding her eggs is more inclined to attack and bite a threat rather than escape.

The venom in adult females is highly poisonous to humans and REQUIRES MEDICAL ATTENTION. Some people feel the bite (like a pin-prick), others do not. Pain will eventually begin at the site of the bite, and then it spreads to the stomach and back with cramping in the first 8-12 hours of the bite. Other symptoms also may include sweating, nausea, tremors, restlessness, fever and a headache.

If you suspect you have been bitten by a Black Widow, do not attempt to suck out the venom. Immediately wash the bite area with soap and water. Put ice on the bite site and elevate that body part. Seek medical attention immediately if symptoms persist or worsen. Though it is rare for humans to die from a Black Widow bite, early treatment can reduce pain and other symptoms, and hasten recovery. This treatment may include taking antivenom and other medications. Small children are particularly sensitive to the venom. Those with heart conditions may need hospitalization. Every human body is different. It is critical to let a medical professional assess the victim and treat this kind of spider bite.©InsectIdentification.org

Known Diet of the Southern-Black-Widow

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General Characteristics

Capability, Shape, Texture/Pattern, Benefits, Dangers
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Taxonomic Hierarchy

Species Breakdown
Kingdom: Animalia
  Phylum: Arthropoda
    Class: Arachnida
      Order: Araneae
        Family: Theridiidae
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          Genus: Latrodectus
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            Species: mactans

Identifying Information

Size, Colors, Features
Scientific Name: Latrodectus mactans
Other Name(s): Southern Black Widow
Category: Spider
Size (Adult; Length): 3mm to 10mm (0.11" to 0.39")
Colorwheel Graphic Colors: white; red; black; orange; brown; yellow; white
Descriptors: shiny; pattern; hourglass; widow; biting; venomous; harmful

Relative Size Comparison

Typical Size Between 3mm (0.1in) and 10mm (0.4in)
Lo: 3mm
Md: 6.5mm
Hi: 10mm

Territorial Map*

U.S., Canada, and Mexico
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Prince Edward Is.  
* MAP NOTES: The territorial heat map above showcases (in red) the states and territories of North America where the Black Widow may be found (but is not limited to). This sort of data is useful when attempting to see concentrations of particular species across the continent as well as revealing possible migratory patterns over a species' given lifespan. Some insects are naturally confined by environment, weather, mating habits, food resources and the like while others see widespread expansion across most, or all, of North America. States/Territories shown above are a general indicator of areas inhabited by the Black Widow. Insects generally go where they please, typically driven by diet, environmental changes, and / or mating habits.
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