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Spider Crab

HomeMarine InvertebratesSpider Crab

Spider Crab

Maja brachydactyla

These crabs have spiny carapaces and frequently decorate themselves with algae or sponges for camouflage. They may form large gatherings before moulting, offering a dramatic sight for snorkelers who come across a cluster. Near Lihou’s rocky coast, you might find smaller individuals in deeper pools.

  • Habitat: Rocky reefs, kelp forests, and lower shore zones, often subtidal; may appear in deeper rockpools at low tide.
  • When to See: Mostly spring to autumn in shallow areas; present offshore year-round.
  • Length: Carapace can exceed 15 cm across; long spindly legs.