Poisonous animal

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Redback Spider 12/11/2015 Shuji Ishitobi 1 Professor Christopher YUKNA

Transcript of Poisonous animal

Redback Spider

12/11/2015

Shuji Ishitobi

1 Professor : Christopher YUKNA

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.

Habitats4

Australia

Distribution Areas

Japan

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

What does Redback Spider eat?8

They can survive for 100 days without any food.

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.

Thank you!!

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