Summary description from Wikipedia:

Romaleon antennarium in languages:

English

Pacific Rock Crab

English

Brown Rock Crab

Images from inaturalist.org observations:

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Parent Taxon

• Romaleon

Sibling Taxa

• Romaleon antennarium
• Romaleon branneri
• Romaleon gibbosulum
• Romaleon jordani
• Romaleon setosum

Top Observation Places

• Encinitas
• San Pedro
• Redondo Beach
• Santa Barbara
• San Francisco
• Oakland
• Sunnyvale
• Daly City
• San Mateo
• Chinatown
• Redwood City
• Mountain View
• Alameda
• South San Francisco
• Palo Alto
• Santa Cruz
• Cupertino
• San Rafael
• Watsonville