Red Looper Caterpillar on Grey Box (Family Geometridae)

Red Looper Caterpillar imitating a twig — Unidentified Looper Caterpillar imitating a twig on a Grey Box tree. About 40mm long. The head is at the left.

Classification

Order Lepidoptera - Moths and Butterflies, 10855 named species in Australia
Superfamily Geometroidea - 1369 species in Australia
Family Geometridae - Loopers, 1369 named species in Australia
Genus ?
Species ?