Nature Field Guide
Halloween Land Crab
- Spanish name
- Cangrejo arlequín
- Scientific name
- Gecarcinus quadratus
What Do Pico & Tati Think?
Not every coastal crab lives underwater. Pico and Tati look at the ground beside the path without leaving it.
Species overview
About the Halloween Land Crab
Gecarcinus quadratus is a land crab associated with coastal habitats. Research in Costa Rica describes burrows and the movement of fallen leaves into the ground. Its activity connects the forest floor with the soil below. Adult land-crab behavior should not be confused with that of underwater reef crabs.
Identification
Key Features of the Halloween Land Crab
A crab walking on land near coastal vegetation
Burrows may be present in suitable ground
Confirm the species from the whole animal, not a burrow alone
Habitat & range
Coastal vegetation and adjacent ground. Stay on established routes and do not search inside burrows.
Local observations
Documented in Guanacaste. Also listed in the marine-sector crustacean inventory of Manuel Antonio National Park. Region tags represent documented locations, not an exhaustive range or a promise of occurrence at every beach. Additional regional assignments require locality evidence.
When to observe
Visibility depends on the site, conditions and the animal. Ask a local guide about an appropriate visit; no fixed encounter season is promised.
Conservation & care
Give claws and burrow entrances space. Do not handle, feed, chase or collect crabs. Leave rocks and shells where they are, and follow your adult’s route and local signs.
Observation activity
Draw a fallen leaf and a burrow from your observation point. Explain one way an animal can change its surroundings.