Acanthonyx dentatus

[2] The toothed decorator crab is known around the southern African coast from Cape Columbine to Richards Bay subtidally to 43 metres (141 ft).

It is usually a well camouflaged crab, decorating its carapace with hydroids and seaweeds, offering camouflage and also defence, since hydroids sting and many seaweeds are chemically noxious.

Its carapace is teardrop-shaped with two sharp spines projecting forwards between its eyes.

[3] Vividly coloured when recently moulted, these animals are commonly found taking refuge among groups of striped anemones.

The crabs use the anemones' habit of shooting sticky defensive threads through their body walls for their own defence.