The Find-a-Spider Guide

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Cyclosa trilobata

Fact Box
Cyclosa trilobata (JS)
but some of the images included on this page are a better match for Mascord's Cyclosa insulana, which looks very similar
formerly Argiopidae
Body length:
female: 9 mm
male: 5 mm
In a small circular orb web in low shrubs; the centre of the web usually has several loops of silk that is coarser than the outer regions
This spider may be too small to cause illness in humans but handle with caution
Cyclosa trilobata
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In its web
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Oblique view
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Cyclosa insulana?
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Its debris string
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Another female
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Its egg sac
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Its web
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Cyclosa insulana?

The three-pronged tail is a characteristic of several Cyclosa species but is variable in appearance between species and even within the same species. The same variability is seen in the spiders' surface markings. The male has distinct differences in appearance when compared with the female.

Cyclosa species typically build a web with a central component of heavy zigzag silk but there may also (or alternatively) be a string of insect debris stretched across the web.

Known Range: Because there is uncertainty as to which Cyclosa specimens are actually Cyclosa trilobata the range of this species is somewhat uncertain. If the specimen was found in Northern Australia it may be Cyclosa insulana but if from Southern Australia it is probably Cyclosa trilobata.

Spider(s) with a very similar appearance: Cyclosa bifida.

Email Ron Atkinson for more information.    Last updated 3 January 2022.