SPIDERS

Spider Pest Control SydneyThere are over 500 species of spiders living in Australia and over 35,000 known worldwide. Spiders are not insects, but are arthropods of the class Arachnida.

 

Identifying a Spider

 

Spiders have two body regions, the head and the abdomen. This arthropod lacks antennae and has four pairs of slender legs. Male spiders are generally smaller than the females, though the exact sizes vary depending on the species. For example, an American house spider is about 3/16" long, while a female tarantula is about 3".

 

The Damage Spiders Can Cause

 

Most spiders will not bite unless provoked by handling or other contact. In many cases, bites occur when a person inadvertently comes in contact with a wandering male spider or a spider habit (such as in a seldom used attic or basement). Many spider species cannot pierce human skin with their fangs, and those that can generally leave the area in a state of minor irritation and swelling.

 

Two spiders should be avoid the Sydney funnel-web (Atrax robustus) and the Redback (Latrodectus hasselti) because their bites can be painful for some days.

 

Are those two to be worried about? Since 1956 nobody died from a Redback bite and since 1980 nobody from a Sydney Funnel-web bite, mainly because of the development of an antivenom.

 

White-tailed Spider bites have been controversially implicated in causing severe skin ulceration in humans.The white-tailed spider has a dark reddish to grey, cigar-shaped body and dark orange-brown banded legs. The grey dorsal abdomen bears two pairs of faint white spots (less distinct in adults) with a white spot at the tip; the male has a hard, narrow plate or scute on the front of the abdomen.

 

Spiders' Life Cycle

 

After mating, a female spider will deposit eggs in a silken sac. Depending on the species, one sac can carry 20 eggs or several hundred. In general, those species that tend their eggs will produce fewer per egg sac, while those that abandon the sacs will produce larger numbers.

 

It is extremely rare for a female spider, including the black widow, to eat the male after mating. Many spiders live only 1-2 seasons, but some species can live for as long as 20 years.

 

Spiders' Habits

 

Most spiders are nocturnal and shy of human activity.

 

All spiders are predators and the primary food source is insects and other arthropods. After capturing their prey, the spider will kill or paralyze it with venom. When food is scarce, a spider can survive several weeks or months depending on the species

 

 

Download Spider Chart

 

Symptoms and treatment of spider bites

 

Funnelweb spider

funnelweb spider

Symptoms

  • Pain in area of bite; numbness.
  • Nausea and vomitting
  • Profuse sweating and collapse.
  • Frothing at the mouth because of excess salivation.
  • Patient may turn blue because of breathing difficulty.
  • Cramps and pain in limbs and abdomen.
  • Patient may become delirious.
  • Twitching of facial muscles, contractions of limbs, reflexes sluggish.
  • Eyes fail to respond to light; coma

 

First aid treatment

  • Remove any tight clothing and make patient comfortable.
  • Apply firm pressure over area of bite using a broad roller bandage.
  • Cover bite site, and extend bandage to both the extremity of the limb as possble.
  • Keep movement of that part of the body to a minimum.
  • Remove patient to hospital as soon as possible
  • Avoid stimulants; no liquids taken orally.
  • Warmth to wound reduce pain.

 

redback spiderRedback spider

Symptoms

  • Stinging sensation at bite although no sign may be evident.
  • Swelling around bite and paleness; pain and tenderness.
  • Stiffness around bite area.
  • Pain in lower limbs due to absorption of venom in lymphatic system.
  • Patient shows shock symtoms; pallor, weakness, profuse sweating, nausea and vomiting.
  • Some cases show paralysis of lower limbs.

 

First aid treatment

  • Remove tight clothing and make patient comfortable.
  • Apply a cold pack to the bite being careful not to freeze tissue.
  • Seek medical assistance promptly.

 

 

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