Woodlands Historic Park Caterpillars

Larva of Steel-blue Sawfly (Perga affinis) at Woodlands Historic Park
Larva of Steel-blue Sawfly in their typical daytime defensive cluster on a Red Gum branch.

An adult is shown here.

Classification

from Australian Faunal Directory

Order Hymenoptera - Wasps, Ants, Bees and Sawflies, 12202 named species in Australia
Superfamily Tenthredinoidea - Sawflies, 161 named species in Australia
Family Pergidae - typical Sawflies, 140 named species in Australia
Genus Perga
Species Perga affinis - Steel-blue Sawfly