Contents2
What is Redback SpiderHabitatsTheir figureTheir lifecycleVenomSymptomTreatment and careConclusion
What is Redback Spider?3
Adult female
Adult male
The redback spider (Latrodectushasseltii), also known as the jockey spider, is a species of poisonous spider indigenous to Australia.
The 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.
Red pattern on the back
Color and shape5
Red pattern also stomach
Fang(0.7mm)
Even if bitten from the top of the clothes, it does not reach the skin.
Size6
Male
Female
Male : 3~5mmFemale : 10~15mm
Female only has a poison, there is no poison in themale.
Where does Redback Spider Live?7
• Sunny and warm place• Where there is plenty of food,
such as insects or small animals• Where there is a suitable gap to put the nest
The back of groove Fence Under the planter
Lifecycle of Redback Spider9
JuvenileAdult
Eggs
Internal sac of one egg : 100~200
Egg sac
Male : 58~75 daysFemale : 75~104 days
They work in June-September
Their venom10
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.
Venomgland
Fang
Venom protein
Muscular layerFang and venom gland of redback spider Microstructure of venom
gland of redback spider
Component of the venom11
Name : α-latrotoxin (neurotoxin)
King Cobra : 1.75mg/kgRedback Spider : 0.59mg/kg
Features of α-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)
Their poison is stronger than snake’s it.
Actions of α-latrotoxin12
1. α-latrotoxin is allowed to flow to force the Ca ion by acting from outside the neuron to calcium channels of axon terminals.
2. Neurotransmitter is released all and we provoke such seizures abnormally excited the muscle fibers or neurons
3. Information transmission function of the nervous system is paralyzed.
Symptom13
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.
There are example that people died by anaphylactic shock.
If we are bitten…14
We don’t die by their poison because injection amount of their poison is a little.
If the treatment is delayed, we cause muscle paralysis or skin rot.
However…
Bite treatment and care15
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.
How to remove16
If you found a redback spider, you must not touch it with bare hands.
Spraying Stomping Burning
Conclusion17
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.