update April 2024
Pretty sure that it is a Christmas Jewel Spider! 😊🕸
An egg casing or similar?
update 02/01/2023
I have sent my photos to Australian Museum via "Ask an Expert". :)
update 23/01/2023
Automated email received from Australian Museum - #42656
Confirming enquiry received, but delays expected.
update 24/01/2023
Received reply email from Australian Museum. Suggested Lepidoptera.