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Isala longimana

Fact Box
Species:
Isala longimana
(The source of this identification is as explained below)
Family:
Thomisidae
Body length:
female: maybe 6 mm
male: 4.5 mm
Habitat:
This spider may be found on bark, leaves or flowers and uses its excellent camouflage colours to ambush insects it feeds on
Toxicity:
Unknown but this species is probably harmless to humans
Isala longimana
Click to enlarge
Another specimen
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Another view
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Some characters
Click to enlarge
Underneath male

In Proceedings of the Linnean Society of New South Wales (1902) Volume 27, pages 491-492 W.J. Rainbow described as Stephanopis obtusifrons a spider somewhat similar to the one shown in the images above. Unfortunately, his description of the spider was limited and he only included a very basic drawing of it in his paper. Then in his widely read 1970 and 1980 spider booklets Ramon Mascord presented an image labelled as Stephanopis obtusifrons, his identification based on that of Rainbow and on Stephanopis specimens he had seen in the Australian Museum collection. Images of specimens that looked much the same as the one in Mascord's booklets were subsequently published in various places, including this website, under the Stephanopis obtusifrons name.

But then in 2019 Machado M. et al in Records of the Australian Museum, 71, 217-276 suggested that Stephanopis obtusifrons is actually the same species as Stephanopis cambridgei, but the images of Stephanopis cambridgei included in that paper were not a close match with those of most of the published Stephanopis obtusifrons images, including the one shown in Mascord's books. It also became apparent that the spiders in the various published S. obtusifrons photos did not all look like the same species. In a follow-up paper (Machado M. and Teixeira R.A. (2020) Phylogenetic relationships in Stephanopis and Sidymella, (Springer Nature), Finally, in 2021 these same authors formalised the renaming of this species as Isala longimana in Organisms Diversity and Evolution 21(2) 281-313. It should also be pointed out that the spider shown above looks more like a Sidymella species than Stephanopis cambridgei and the only known Isala species: Isala punctata.

Known range: Occasionally found in South-east Queensland and down the coast to Melbourne and across to Tasmania.

Spider(s) with a very similar appearance: Some Sidymella and Stephanopis species.
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Email Ron Atkinson for more information.    Last updated 1 July 2022.