Tuesday, January 10, 2006

Avondale Spiders

New Zealand is known for having absolutely no snakes and hardly any spiders (compared to Australia where there are thousands of deadly creatures everywhere you turn). But we managed to move to the one neighbourhood in Auckland (Avondale) that is known for its large, hairy spider. Who knew.

Apparently, the Avondale spider is quite famous in the spider world because it was the species that was used in the movie Arachnophobia. They're up to 8 inches across and pretty hairy, but entirely harmless (so they say). That made it perfect for scaring the pants off the audience, but not endangering the actors during filming. Still, I'm hoping never to see one personally.


Avondale seems to have embraced its reputation as a spider town. There is a large spider sculpture (named Dale ... get it? ... AvonDALE?) in the town square, which has become a local landmark.





And the Avondale school uses the spider as its mascot.





Here's what the NZ scientists say about the AVONDALE SPIDER:
Delena cancerides Walckenaer
(Araneae: Sparassidae)

The large harmless spider found around the Avondale area of Auckland is an Australian huntsman spider. This spider found its way to New Zealand in the early 1920s, with the first specimen found in 1924. It probably came in imported wood used for railway sleepers. It has not spread very far from Avondale, so it has received the popular name of Avondale Spider. In South Australia this species is quite common, and people encourage them to live in their houses to keep the pest insect population down.

Where found
They are nocturnal and like to hide during the day in dark, dry places. In their natural habitat, which is under loose-fitting bark of wattle trees, they live in large colonies. Around houses they hide in attics, under corrugated iron, behind pictures and bookcases, and in sheds and garages.

Food
These spiders are fascinating to watch. They sit motionless on walls and then rush after prey. They very quickly devour prey, sucking all the juices out and discarding the hard outer pieces. Their favourite foods seem to be moths, flies, cockroaches, and earwigs.

Size
The first reaction of most people on finding Avondale spiders is usually horror. The spiders move very fast when disturbed (as do people when frightened!). Mature spiders with legs outstretched can measure up to 200 mm across (8”).

Life history
The mature males are frequent visitors inside houses in the months January to March when they are looking for a female to mate with. Females are capable of laying up to 200 green eggs in an oval-shaped, white papery-looking egg sac about 25 mm long (1”) by 12 mm wide (1/2”). Females guard their egg sac, and after 4-6 weeks open this up to enable the spiderlings to hatch. They will look after the spiderlings for a few more months until they disperse. Spiderlings will feed communally if the prey is too big for them to manage on their own.

by Grace Hall
Landcare Research

2 comments:

Anonymous said...

These are incredible spiders! Unfortunately, Hollywood, once again, has used a harmless and beneficial creature to stir up ignorant primordial fears among humans. Too bad they don't focus on the benefits of creatures like these, but then that wouldn't sell as much popcorn.

Anonymous said...

For my topic, the assessment is to choose a NZ spider and do two or three pages about them. I chose the Avondale spider because it was a spider I had never heard of. This spider is very interesting to study and is helping me to get over my serious case of Arachniphobia.