Decorator Crab

Picture of Decorator Crab

Description of the Decorator Crab

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.

Picture of a Decorator Crab

Decorator Crab

Facts - Information - Picture - Video

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

Interesting Facts and Information - How do you identify the sex of a Decorator Crab?
The males and females of many fish species have different colors or different shaped bodies. But there are also other fish species where there is no visible difference. Its sometimes tricky being an ichthyologist!


Interesting Facts and Information - Why do Decorator Crab have gills?
Gills enable the Decorator Crab to breathe. Gills consist of thin sheets of tissue containing blood vessels. As water passes over the gills oxygen is absorbed into the blood stream Carbon dioxide passes out into the water. The gills are protected by a large bony plate called an operculum. Some fish species however have lungs and breathe air.

Interesting Facts and Information - Why is the Decorator Crab called an Arthropod?
An Arthropod is an invertebrate animal (without a backbone) that has a segmented body with jointed limbs (appendages). True crabs are Decapod Crustaceans. Some species such as Hermit crabs, Porcelain crabs King crabs and Horseshoe crabs are not true crabs!  Decapod Crustaceans have five pairs of legs, the first three are used for feeding. At the end of the limbs are the chelae which is the correct term for pincers or claws.

Interesting Facts and Information about Decorator Crab

Decorator Crab

  • Interesting Information about Decorator Crab

  • Facts about Fish Species - What are Crustaceans?

  • Why do the Crustaceans have an exoskeleton (external skeleton)?

  • Facts about Fish Species - Why are Crustaceans called Arthropods?

  • Species: Naxia tumida

Fish Species

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