John Shaw / Sally lightfoot crabs (Grapsus grapsus) on the beach at Puerto Egas, Santiago Island, Galapagos, May.

Sylvain Cordier / Ghost crab (Socotrapotamon socotrensis ) Socotra Island UNESCO World Heritage Site, Yemen.

Sylvain Cordier / Ghost crab (Socotrapotamon socotrensis) Socotra Island UNESCO World Heritage Site, Yemen.

Sylvain Cordier / Socotran freshwater crab (Socotra pseudocardisoma) Homhil plateau, Socotra Island, UNESCO World Heritage Site, Yemen

Emanuele Biggi / Cave crab (Cerberusa caeca), Fast Lane Cave, Gunung Mulu National Park, Borneo, Sarawak, Malaysia.

Aflo / Japanese freshwater crabs (Geothelphusa dehaani)

Chien Lee / Cave Crab (Cerberusa tipula) endemic to the limestone caves of Gunung Mulu National Park, Malaysia

Mark Moffett / Socotra Freshwater Crab (Socotrapotamon socotrensis), Socotra, Yemen