Genevieves Project Redback Spiders


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Genevieves Project Redback Spiders

  1. 1. Redback Spiders(Latrodectus hasselti) <br />By Genevieve<br />
  2. 2. Description<br />Redback spiders belong to the Family Theridiidae which can be found all around the world. <br />The Redback spider is one of Australia’s most common species and is found in the bush and the city.<br />They have a distinctive longitudinal red or white stripe on their upper abdomen. <br />
  3. 3. Description<br />Mature female Redback spiders are black with a red stripe on there upper abdomen and can grow up to 1 centimetre.<br />Immature female Redback spiders are smaller and usually brown with white markings.<br />Male Redback spiders are brown with red and white markings. They can grow 3 to 4 millimetres in size. <br />
  4. 4. Their Food<br />Redback spiders usually eat insects. They are able to capture larger animals such as male trapdoor spiders, king crickets and small lizards if they become entangled in their webs.<br />Prey-stealing is also common with large female redback spiders taking stored food from others’ webs.<br />
  5. 5. Where they live <br />Redback spiders are found all around Australia and live almost anywhere as long as there is adequate food and a good sheltered warm place for breeding.<br />In the bush they nest under logs and rocks.<br />In the city they can be found in dry places around buildings, outdoor furniture and machinery.<br />
  6. 6. Their Web<br />A web is made of vertical, sticky catching threads.<br />Females make a funnel shaped web.<br />Built in dry, sheltered places such as rocks, logs or toilets.<br />
  7. 7. Their Life Cycle<br />The male spider hangs around near a female&apos;s web. He gets the female spider’s attention by showing her his abdomen. Many males are eaten as they mate!<br />Once the female has mated she makes about 10 white egg sacs, 1 every 3 weeks or so. Each sac has about 250 eggs. The sacs hang in the web. When they hatch the tiny, pale-green spiderlings balloon away on silk threads.<br />Female redbacks live for about 2-3 years. Males live for about 6-7 months.<br />
  8. 8. Theirbite-venom<br />Only the female red back spider bite is dangerous.<br />If bitten the venom can cause in pain, sweating, nausea, vomiting and even death.<br />Antivenom medicine is available.<br />
  9. 9. Other Interesting information<br />They are a close relative of the Black Widow Spider found in the USA.<br />Redback spiders are not aggressive and rarely leave the web.<br />Bites usually occur when part of the body comes in direct contact with the spider or its web.<br />
  10. 10. A female red back spider<br />The male redback spider is only about <br />one-third the size of the female.<br />
  11. 11. References<br />CSRIO<br />Australian Museum<br />Wikipedia<br />