Researchers discover new large crab species on Costa Rica island

A new species of large land crab has been discovered on Cocos Island in Costa Rica, according to a local newspaper.

University researchers from Costa Rica and the US discovered the new species, named Johngarthia cocoensis, on the Pacific Ocean island.

The distinguishing characteristic of J. cocoensis, according to the researchers, is its large size – a male can measure 40 cm with its front legs extended (females are smaller).

The crabs live in holes dug into the soil and eat primarily grasses and seeds.

Robert Perger and Rita Vargas, from the University of Costa Rica, and Adam Wall from the Los Angeles County Natural History Museum are credited with discovering the new species. Mr Perger told the local newspaper that J. cocoensis resembles the J. malpilensis crab, which lives on nearby islands.

“The similarity with other species in the western Pacific indicates that larvae (which develop in the sea) may have crossed to Cocos Island by sea currents,” and then adapted to the habitat to grow into a new species, he said.

Cocos Island is located off the coast of Colombia but within the territorial waters of Costa Rica, and is the only island in the Western Pacific that has a humid tropical forest climate and awide variety of animal species.