The Find-a-Spider Guide

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Eriophora biapicata

Fact Box
Eriophora biapicata (JS)
(but see notes below)
Previous species name:
(formerly Argiopidae)
Body length:
female: 20 mm
male: 16 mm
In a vertical orb web at night but in a retreat above the web by day
Uncertain; may cause mild illness but this spider is not aggressive towards humans
Eriophora biapicata
Click to enlarge
The male
Click to enlarge
Underneath male

The photos shown on this page are thought to be those of Eriophora biapicata as described by VT Davies (Queensland Museum) in 1980 but it is now clear that some or all of them could instead be Eriophora transmarina which Davies also named. The descriptions given by Davies for these species are now very difficult to access but it is generally agreed that the males and females of both E. biapicata and E. transmarina are so similar in appearance (both varying greatly in surface markings from specimen to specimen) that the two species can only be distinguished by a careful comparison of their genitalia. Indeed, there is some justification for suggesting they are not separate species but are actually part of what should be referred to as the 'Eriophora transmarina complex'. However, at the present time E. transmarina is claimed to be the species most likely to be found in Northern Australia (never south of Sydney) but not in arid regions whereas E. biapicata is the more common species in Southern Australia and in the arid centre of the continent. Unfortunately, the ranges of these two species overlap in South Queensland and Northern NSW.

Spider(s) with a very similar appearance: Eriophora species, particularly Eriophora transmarina, Eriophora pustulosa and Acroaspis tuberculifera.

Email Ron Atkinson for more information.    Last updated 3 January 2016.