Quick Black Widow Spider facts
1. Adult female black widows are usually shiny black with a…Adult female black widows are usually shiny black with a red or orange hourglass marking beneath the abdomen.
2. Females build irregular three-dimensional cobwebs rather than neat circular orb websFemales build irregular three-dimensional cobwebs rather than neat circular orb webs.
3. Strong silk lines transmit vibrations made by trapped insects directly to the spiderStrong silk lines transmit vibrations made by trapped insects directly to the spider.
4. Venom contains latrotoxins that overstimulate nerve endings and can cause…Venom contains latrotoxins that overstimulate nerve endings and can cause severe muscle pain in people.
5. Serious bites are uncommon because black widows generally retreat when disturbedSerious bites are uncommon because black widows generally retreat when disturbed.
6. Males are much smaller and usually carry lighter markings than mature femalesMales are much smaller and usually carry lighter markings than mature females.
7. Sexual cannibalism occurs but is far from inevitable during every matingSexual cannibalism occurs but is far from inevitable during every mating.
8. Different black widow species occur on several continents in warm sheltered habitatsDifferent black widow species occur on several continents in warm sheltered habitats.
9. Black Widow Spider is an arachnidBlack Widow Spider is an arachnid, so a typical adult has eight walking legs rather than the six found in insects.
10. Its body is protected by a chitinous external skeleton that…Its body is protected by a chitinous external skeleton that must be molted during growth.
11. Black Widow Spider lacks antennaeBlack Widow Spider lacks antennae, a key feature separating arachnids from insects and many other arthropods.
12. The first pair of mouth appendages are cheliceraeThe first pair of mouth appendages are chelicerae, structures specialized for feeding or prey handling.
13. Pedipalps beside the mouth function in sensingPedipalps beside the mouth function in sensing, feeding, mating or prey control depending on the species.
14. Black Widow Spider is ectothermicBlack Widow Spider is ectothermic, so temperature strongly influences its activity and metabolic rate.
15. Like other arachnids, it belongs to the arthropod lineage and…Like other arachnids, it belongs to the arthropod lineage and has jointed appendages controlled by muscles inside the exoskeleton.
16. Growth occurs in stages separated by molts because the rigid…Growth occurs in stages separated by molts because the rigid outer body covering cannot expand continuously.
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Why black widow spider are fascinating
Black widow spiders are glossy web builders whose neurotoxic venom is delivered through small but effective fangs. Looking at these traits together reveals how the animal solves the everyday challenges of feeding, movement, communication, reproduction and survival.
Frequently asked questions
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