Poisonous Redback Spider

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Redback spider is one of the poisonous spider. Their origin is Australia and they have a strong poison. They have red spots on their back. So they are called "redback" spider.

Transcript of Poisonous Redback Spider

  • 1. Professor Christopher YUKNA8/01/2014 Masahiro Yakeya 1

2. Contents What is Redback Spider Habitats Their figure Their lifecycle Venom Symptom Treatment and care Conclusion2 3. What is Redback Spider? The redback spider (Latrodectus hasseltii), also known as the jockey spider, is a species of poisonous spider indigenous to Australia. Adult femaleThe redback is one of the few spider species that can be seriously harmful to humans, and its preferred habitat has led it to being responsible for the large majority of serious spider bite in Australia. Adult male3 4. Habitats Distribution AreasJapanAustralia4 5. Color and shapeRed pattern also stomachRed pattern on the backFang (0.7mm) Even if bitten from the top of the clothes, it does not reach the skin. 5 6. Size Female Male : 3~5mm Female : 10~15mmMale Female only has a poison, there is no poison in the male. 6 7. Where does Redback Spider Live? Sunny, warm place Where there is plenty of food, such as insects or small animals Where there is a suitable gap to put the nestThe back of grooveFenceUnder the planter7 8. What does Redback Spider eat?They can survive for 100 days without any food. 8 9. Lifecycle of Redback Spider EggsAdultEgg sacInternal sac of one egg : 100~200JuvenileThey work in June-SeptemberMale : 58~75 days Female : 75~104 days9 10. Their venom Venom is produced by glands in the cephalothorax, and expelled venom travels through paired ducts from the cephalothorax, exiting through the tip of the spider's hollow fangs. Venom glandVenom proteinFang Fang and venom gland of redback spiderMuscular layer Microstructure of venom gland 10 of redback spider 11. Component of the venom Name : -latrotoxin (neurotoxin) Features of -latrotoxin The only toxic to vertebrate Toxin which is effective in the presynaptic membrane Toxic effect of promoting the depolarization of the central nervous system of vertebrates TOXICITY (Comparison of LD50) King Cobra : 1.75mg/kg Redback Spider : 0.59mg/kg Their poison is stronger than snakes it. 11 12. Actions of -latrotoxin -latrotoxin is allowed to flow to force the Ca ion by acting from outside the neuron to calcium channels of axon terminals.Neurotransmitter is released all and we provoke such seizures abnormally excited the muscle fibers or neuronsInformation transmission function of the nervous system is paralyzed.12 13. Symptom Immediately after being bitten When redback spider bites, almost no pain topical immediately after being bitten and only feel a slight pain at a site bitten even. In some cases, stab mouth is found one or two.5~60 minutes after being bitten Local symptoms appear, pain will increase gradually.60 minutes~ after being bitten Pain bitten over time spread to the entire limb. Local sweating also occur, warmth, itching also often associated with. However, the greatest feature of the local symptoms is pain.13 14. If we are bittenIf the treatment is delayed, we cause muscle paralysis or skin rot.HoweverWe dont die by their poison because injection 14 amount of their poison is a little. 15. Bite treatment and care If we are bitten by redback spider, we have to wash the area of the bite with soap and water. Even if there is bleeding, it is not necessary to the tourniquet and bandage. Chilled on ice the wound, to go to the hospital.15 16. How to remove If you found a redback spider, you must not touch it with bare hands.SprayingStompingBurning 16 17. Conclusion The adult female redback spider has a round body about 1 cm long, with long, slender legs. The body is a deep black (occasionally brownish), with a red (sometimes orange) longitudinal stripe on the upper abdomen. The poison that they have is very strong to the vertebrate. However, if you do not do anything for them, they will not bite. If we are bitten by them, appropriate care is necessary. 17 18. Thank you!!18 19. 19 20. History of Redback spider 1870 : Swedish aracheologist Tamerlan Thorell described the redback spider from specimens collected in Rockhampton and Bowen in central Queensland He named it Latrodectus hasselti in honour of collegue A.W.M van Hasselt. 1902 :German arachnologist Friedrich Dahl revised the genus and named L.ancorifer from New Guinea, which was later regarded as a subspecies of the redback. 1911 : Another subspecies , L. h. aruensis , was described by Norwegian entomologist Embrik Strand. 20 21. History of Redback spider 1959 : Arachnologist Herbert Walter Levi revised the genus Lactrodectus.He focused on differences in the morphology of the female sexual organs, he reclassified the genus reducing the number of recognized species from 22 to 6. ~Recently : More reliable genetic studies have split the genus into about 30 species, and the redback has no recognized subspecies in modern classifications. 21 22. Nest of Redback spider The nest that they build is irregular and have a threedimensional structure strung complicated.Nest areaCapture area Mucus of capturing is attached to the thread. 22 23. Fatal case Redback spider bites rarely cause chronic morbidity , and deaths are even more rare. Throughout the history, at least 14 deaths from redbacks have been recorded. Children, the elderly, or those with serious medical conditions are at much higher risk of severe effects and death resulting from a bite.DangerousDangerousDangerous23 24. Relationship with humans Their net is used to cross line of optical instruments surveying instruments, rangefinder, microscope, bombsight, such as telescopic sight.The study that made full use of genetic engineering, and a thread of this spider is produced to bacteria is going by the fund of the United States Army.24 25. Japanese spiderChiracanthium japonicum (kabakikomachigumo)Latrodectus mactans (kurogokegumo) 25