Little Seaweed Crab

Naxia tumida
Image by Christine Walsh.

The seaweed decorator crab is a small crab common in rocky inter-tidal areas on the temperate coasts of Australia.

It covers itself with seaweed as camouflage; this weed is attached with hooks and a secretion which becomes adhesive when hardened. In other species they use sponges or anemones instead of seaweed. It is a small crab of the family majidae (with a carapace up to 4 centimetres or 1.6 inches in diameter).