Known collectively as case moths, leaf case moth, leafy case moth, bag moths, ribbed case moth or bagworms, these insects belong to the Family Psychidae, there is thought to be over 1,300 known species worldwide, of which at least 350 species in Australia.

The Leaf Case Moth (Hyalarcta huebneri) is a species of a given group of moths whose caterpillars make mobile homes from silk, usually attaching plant material, detritus or sand grains to the outside.

In Central Australia, there are several species of Case Moth, common species being the Leafy Case Moth (Hyalarcta huebneri) and the Ribbed Case Moth (Hyalarcta nigrescens).

The Ribbed Case Moth has a case that consists of a silken bag and unlike others is not decorated with plant material, instead it has several ridged ribs running along its length. The Leafy Case Moth uses small pieces of leaf from the host plant to decorate the case, however they have also been known to use pieces of twigs, and is sometimes confused with the Stick Case Moth (Clania lewinii).

Common name
Leaf Case Moth, Case Moth, Leafy Case Moth, Leafy Case Moth, Bag Moth, Ribbed Case Moth or Bagworms.

Many species of case moth caterpillars feed on plants, whilst others are known to feed on lichens. You can often see them dragging their protective case along the ground, looking for their food plant, a trunk of a shrub or tree to climb up and when ready to pupate, will search for a spot to attach one end of their protective case to a surface such as the shrub/tree they are eating from, with silk and hang there. They have also been seen attached to walls and other human made surfaces.

The caterpillar is a very skilled climber and is able to climb any surface by creating a silk ladder attached to the surface they are climbing.

Pupation can be just a few weeks to a few months depending on the season and the weather. The female adult has no wings and remains in the case. The male has short wings with a longish abdomen, that allows it to mate with the female who remain inside her case, where she lays her eggs.

The discarded casing is left after the moth pupates.

  • Scientific classification
  • Kingdom: Animalia
  • Phylum: Arthropoda
  • Class: Insecta
  • Order: Lepidoptera
  • Family: Psychidae
  • Subfamily: Oiketicinae
  • Genus: Hyalarcta
  • Species: H. huebneri
  • Binomial name: Hyalarcta huebneri

Footnote & References

  1. PSYCHIDAE in Australia, Bagworms, Case Moths, Coffs Harbour Butterfly House,
  2. Saunders’ Case Moth (Metura elongatus), Australian Museum,
  3. Bagworm moth, (last visited July 4, 2021).