Hyastenus elatus

Hyastenus elatus is a species of crab in the family Epialtidae. It is one of several decorator crabs, habitually covering itself in aposematic sponges which may also serve as camouflage.

References

1. Hyastenus
2. Decorator crab
3. Self-decoration camouflage
4. List of marine animals of Australia (temperate waters)