Fish Species

Decorator Crab

Decorator Crab - Description

The Decorator Crab is also known as the Seaweed crab and belongs to the Majidae family of crabs. They are also referred to as 'Spider Crabs' due to the shape of their body or carapace.

The Decorator crab has spikes on its exoskeleton which it attaches algae to in order to camouflage itself from predators. No two decorator crabs look the same as their colour depends of the type of algae, sponges or seaweed they have chosen to disguise themselves with.

Popular Name: Decorator Crab
Species: Naxia tumida

Profile of the Decorator Crab

This Profile contains interesting facts and information about the Decorator Crab species.

  • Size: Up to 4cm

  • Fish Tank conditions: PH 8.1-8.4

  • Diet / Feeding: Clams, Small fish and Crustaceans

  • Temperament: Semi-Aggressive

  • Habitat: Intertidal rocky shores off the coast of Australia

  • Range: Indo-Pacific

Scientific Classification of the Decorator Crab

Definition: Scientific classification, or biological classification, is how biologists group and categorize species of organisms with shared physical characteristics. Scientific classification belongs to the science of taxonomy.

  • Species: Naxia tumida

  • Popular Name: Decorator Crab - Seaweed Crab

  • Kingdom: Animalia

  • Phylum: Arthropoda

  • Class: Malacostraca

  • Order: Decapoda

  • Family: Majidae

Crustaceans Index

Facts about Fish Species - Decorator Crab

The colours, shapes and sizes of individual fishes varies enormously - you really need excellent quality pictures or photographs to assist in the identification process.


A combination of the number of fins and their characteristics, color, scale counts, general features, maximum length and distribution are used during a species identification process.

The species detailed on this website are Tropical, Saltwater, Aquarium , Marine , Pet , Pond, Clown, Koi,
Beta (Betta), Gold Fish (Goldfish), Star, Angel, Puffer, Discus, Piranha, Rainbow, Parrot, Crustaceans, Sea Anemones and Coral.

For more information and pictures of the Decorator Crab visit the
Full Fish Species Website

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