The Find-a-Spider Guide

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Water spider

Fact Box
Species:
Megadolomedes australianus
(QM) (Older books may call this spider a Dolomedes species)
Family:
Pisauridae
Body length:
female: at least 25 mm
male: at least 20 mm
Habitat:
This spider is often seen running on the surface of still-water ponds. It can lay eggs underwater in large air bubbles. Some specimens live in an irregular web just above the water level.
Toxicity:
Possibly can cause mild illness in humans
Megadolomedes australianus
Click to enlarge
Adult female
Click to enlarge
Another female
Click to enlarge
Another female

Spider(s) with a very similar appearance: The water spider Dolomedes instabilis and wolf spiders such as Lycosa godeffroyi, although it is noteworthy that water spiders lack the pair of large eyes that characterise lycosids.


Email Ron Atkinson for more information.    Last updated 9 February 2011.