Invertebrate · GBIF taxon 2225815
Marbled Crab
Pachygrapsus marmoratusAlso known as Marbled Rock Crab
Marbled crabs dart swiftly across exposed coastal rocks, scrambling above the waterline to graze on algae and pry open small shellfish. Their flat, square carapaces feature a distinctive dark purple and yellow marbled pattern that blends seamlessly into damp stone. Highly agile and surprisingly terrestrial, they quickly retreat into tight crevices at the slightest sign of danger.
IntertidalOmnivoreCoastal
—observations
—countries
—peak records
Least ConcernConservation statusIUCN Red List categoriesLCNTVUENCREWEXLeast ConcernRed List categories, explained →
Diet & prey
- Mussels
- Limpets
- Algae
Predators
- Seagulls
- Octopuses
- Predatory Fish
ThreatsCoastal development, water pollution, oil spills
HabitatsRocky intertidal zones, tidepools, sea walls
Life span3 to 5 years
Size / weightNot available
Classification
- FamilyGrapsidae
- SpeciesPachygrapsus marmoratus
Range data is not available yet.
Interaction riskLow
- Low
- Moderate
- High
- Very high
- Why interaction risk is low
- Strong claws can deliver a painful pinch if handled; observe from a polite distance.
Responsible observation
- Observation: Watch them grazing on algae or hunting shellfish along rocky shores during low tide.
- Handling: Avoid lifting or cornering crabs, as their sharp claws can pinch defensively.
- Tidepool Etiquette: Leave damp rocks in place to preserve essential shelter and moisture.
Habitat Competitor Primary Prey Close Relative
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