Gum Tree Shield Bug - Theseus modestus
Family Pentatomidae
This page contains pictures and information about Gum Tree Shield Bugs in genera Theseus that we found in the Brisbane area, Queensland, Australia.
- Body length 15mm
- This shield bug looks very similar to the Common Gum Tree Shield Bug. Both can be found on the gum tree trunk. However, this shield bug is less common in Brisbane.
- Because those difference species of Gum Tree Shield Bugs look so similar and live in the same environments, we believe they may have form a Mullerian mimicry complex. In Mullerian mimicry, the model is not defined and several unpalatable species share warning colors or patterns to evade predation. Both models and mimics are toxic. Several species from several different orders may comprise a mimicry complex. The advantage is that the predators need only encounter one form to shun the entire complex.
Nymphs
- We believed they are the nymphs of this species, but not exactly sure.
- Reference:
- 1. Insects of Australia, CSIRO, Division of Entomology, Melbourne University Press, 2nd Edition 1991, pp 509.
- 2. FaunaKeys - Stink Bugs of Australia, Australian Museum online 2003.
- 3. Theseus modestus - Australian Biological Resources Study, Department of the Environment and Heritage, Commonwealth of Australia 2005.
- 4. Poecilometis modestus Stål, 1865 - Types of Heteroptera, Swedish Museum of Natural History
- 5. Theseus Stål, 1867 - by Gerry Cassis, Emma Betts and Michael Elliott, Stink Bugs, Fauna Net, Australian Museum 2002.
