redback spider latrodectus hasselti, myall park botanic garden, glenmorgan, queensland australia
the redback spider s original range considered parts of south australian , western australian deserts, has since invaded rest of australia , several places overseas, including new zealand, united arab emirates, united kingdom , japan. redback performs sexual cannibalism during mating, female eating male sacrifices himself. obvious sign of redback bite extreme pain accompanied localised sweating, beginning 3 5 minutes after being bitten. sweating becomes more generalised. result of body reacting own neurotransmitter chemicals leaking nerve junctions @ bite site. systemic effects such feeling sick, abdominal pain , nausea can brought on trauma , associated pain. 4 randomized controlled trials of reback antivenom, developed in 1956, have occurred. isbister et. al. reported in 2015 patient whom antivenom considered must informed there considerable weight of evidence suggest no better placebo, there risk of anaphylaxis , serum sickness, , routine use therefore not recommended.
the sydney funnelweb spider atrax robustus, considered world’s dangerous spider. found within 100 km diameter circle around sydney. no deaths have occurred since advent of antivenom in 1981. males wander @ night in spring , summer in search of females. wander houses or fall swimming pools, can stay alive underwater long periods. species has been milked research @ james cook university cairns use in cancer treatments.
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