Black Orange Spot House Spider or Redback Spider
Latrodectus hasseli, or redback spiders, are native to Australia. They have been found in all parts of the country. Because of tourism and commerce, they are now found in New Zealand, Japan, and the UAE. These spiders are found primarily in arid regions and make their homes in sheds, woodpiles, outdoor furniture, machinery and garages. These spiders may also appear near rocks and tree bark.
Redback spiders are most commonly jet black in color and can be identified by an orange or faded red spot on the upper side of the abdomen. Red or orange hourglass-shaped markings are present on the underside of the abdomen. Some specimens may have brown bodies mottled in white. White spots also appear on the abdomens of young redback spiders, or juveniles. Female redback spiders are larger than males and can reach lengths up to 15 millimeters. The leg span of these arachnids may be as long as 30 millimeters.
Redback spiders are members of the “Widow” spiders, along with the Black widow spider that is found in the United States. Although redback spiders usually bite only when provoked, their venom is dangerous and may prove fatal if appropriate treatment is not administered in a timely manner. Symptoms of redback spider bites include nausea, fever, vomiting, heart palpitations, sweating, weakness and convulsions. Pressure should never be applied to bite wounds. Ice is recommended for superficial treatment of discomfort, although medical attention is typically necessary. If possible, bite victims should capture the offending spider for identification purposes