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Aporocera (Aporocera) viridis
A very small metallic coloured beetle about 4mm long. Tints of green and red depending upon angle of sun. Relatively long antennae compared to leaf beetles for example. Elytra heavily pitted. I initially thought this might be a flea-beetle but the largest femurs are on the front pairs of legs. Note: take reading glasses next time.
On a Eucalyptus microcarpa in suburban back yard.
Thanks Stephen Thorpe. Case-bearing beetle Associated with dead wood or old trees. Coastal and big river drainage basins. Probably capable of flight. Very likely A viridis... size, shape, antennae segments match.
http://www.tfic.net.au/SpeciesPages/Apor...
http://bie.ala.org.au/species/urn:lsid:b...
A synonymous named may be resurrected by Dr Chris Reid - Chloroplisma viridis - http://bie.ala.org.au/species/Chloroplis...
Possibly Aporocera viridis, see: http://www.tfic.net.au/SpeciesPages/Apor... and http://www.environment.gov.au/biodiversi...