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These are four winged galls induced by an eriococcid gall-forming scale insect (hemipteran). The female gall has a broad base with four horns that are like blades in this case . Pic 2 shows two short tubular male galls arising from the female gall.
There were numerous galls seen on this tree trunk arising from what looked like massive scars(pic 4).
Spotted on a swamp gum (Eucalyptus ovata) in a reserve.
The blades on the galls are rather dramatic, twisting and flexing in all directions. The female insect is wingless and remains in the gall all her life. Males are weak fliers but they do leave the gall to find a mate.
I did not want to dissect any of these as the reference has all the details.
Spotted on Feb 2, 2020
Submitted on Feb 2, 2020
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