2. Contents2
What is Redback Spider
Habitats
Their figure
Their lifecycle
Venom
Symptom
Treatment and care
Conclusion
3. What is Redback Spider?3
Adult female
Adult male
The redback spider (Latrodectus
hasseltii), 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.
5. 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.
7. 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
8. What does Redback Spider eat?8
They can survive for 100
days without any food.
9. Lifecycle of Redback Spider9
JuvenileAdult
Eggs
Internal sac of one egg : 100~200
Egg sac
Male : 58~75 days
Female : 75~104 days
They work in June-September
10. 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.
Venom
gland
Fang
Venom protein
Muscular layerFang and venom gland of
redback spider Microstructure of venom
gland of redback spider
11. Component of the venom11
Name : α-latrotoxin (neurotoxin)
King Cobra : 1.75mg/kg
Redback 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.
12. 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.
13. 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.
14. 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…
15. 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.
16. How to remove16
If you found a redback spider, you must not touch it
with bare hands.
Spraying Stomping Burning
17. 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.
