Among seagrass (Amphibolis antarctica) wrack.
on Acacia excelsa excelsa (https://inaturalist.ala.org.au/observations/165212261); body length 5.5 mm
It looks a bit Ampagia-esque but I won't make the call. On Marram at Carlton Beach.
Aggregation sheltering from colder weather.
On a Eucalyptus tree.
on Acacia sp.; body length 14 mm