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I found this insect case in my garden in the south of Melbourne (Australia), on concrete under some dried leaves of a tree that I'd cut down.

insect case

It is 8 cm long, which is pretty big for an insect! The photo is of the underside. I don't recognise it. What species is it?

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This appears to be the exuvia (i.e., molted) pupa of some sort of moth.

One Australian species with a similar-looking and sized pupa is the bardee or rain moth (Trictena atripalpis; or Abantiades atripalpis):

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Credit: Dianne Clark ; Source: Coffs Harbour Butterfly House

See another similar looking (and coincidentally 8cm long) specimen here:

enter image description here

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