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Hyalinaspis genus
All species in genus Hyalinaspis construct typical clam-shell shape lerps and their host plants are Eucalyptus. They construct a simple laminate lerp in bivalves shape. Lerps may look similar in different species though it varies in shape and smoothness. Lerps are formed from the sugar and wax excreted by the insects. Those materials harden on contact with air to form the protection. Lerps vary in size and in bivalves shape.
Gumleaf
The hole in the top suggests it was empty.
I had never seen something like this before. Thanks for sharing! Is a spotting that may fit in the Mission for Animal Architecture:
http://www.projectnoah.org/missions/8082...