Bottlebrush sawfly larvae
Seen feeding on Callistemon citrinus. This grouping was on both sides of the leaf, you can just see the others poking up behind. I found it interesting that the two sets on either side had remained in sync, reducing the leaf at equal speeds.
Body length 10 mm
Pterygophorus cinctus is a swafly recorded in Australia. The adult Bottlebrush Sawfly has an orange and black banded body, with a wingspan of about 2cm. Males have feathery (pectinate) antennae.