ST ANDREWS CROSS SPIDERS

St Andrews Cross Spiders look just like a cross suspended between a tangled web. They use thick zigzag bands of silk in their webs that may attract insect prey by reflecting ultra violet light. St Andrews Cross Spider make suspended, sticky, wheel shaped orb webs. Webs are placed in low shrubby vegetation. The banded upper abdomen is named after the bluish-white cross-shaped pattern of silk through the centre of the web resembling the St. Andrews cross on the Scottish flag. The male is smaller than the female. They are usually calm and not aggressive and the bite of the St Andrew’s Cross Spider poses a very low risk for humans.
These spiders wrap silk webs around vegetation to trap insects like flies, mosquitoes, butterflies and smaller bugs. They usually wrap the silk web neatly around the prey to prevent it from escaping and then slowly inject their venom to paralyze the prey before eating it.

QUICK FACTS

Common name St Andrew’s Cross Spider
Scientific name Argiope Keyserlingi
Weight Approximate 1.2 to 5 grms
Length Approximate 3 to 16mm
Color Silver, Yellow, Red, Brown and Block
Mating Season Summer-Autumn
Number of eggs Approximate 500 to 1200
Habitat Low Shrubby Vegetation
Lifespan

LIFE CYCLE

Egg: Average number of eggs laid by this spider is 400-1400.These eggs hatch in autumn.

Spider Lings: The spider lings emerge during the spring. The egg sac is composed of multiple layers of silk and is designed to protect its contents from damage.
The female body length is 10-16 mm while the male body length is 3 to 4 mm. Females have a silver, yellow, red and black banded upper abdomen with two longitudinal yellow stripes below.

Damage:The bite of the St Andrews cross Spider is of low risk to humans. They are a non-aggressive group of spiders. They are not dangerous. They might bite if grabbed, however, other than for defense they have no interest in biting humans.