With copper-blue blood prized by modern medicine and a body plan older than dinosaurs, the horseshoe crab reveals how ancient ...

When researchers discover fossils of species that are new to science it’s only natural that they attempt to find a place for them in the colossal tree of life, matching them up with related species ...

Despite their names, hermit crabs, king crabs and horseshoe crabs are not true crabs. Neither are porcelain crabs, decapod crab-like crustaceans that live in shallow water throughout the world’s ...

Scientists have discovered a creepy new type of crab that disguises itself in hair scraped from other sea creatures. Despite their menacing appearance, the “fluffy” beasts actually use it as a ...

An environmental advocacy group is suing the federal government to force regulators to decide if the American horseshoe crab, ...

"Meet the Mitten Crab, an invasive species native to East Asia that has found its way into New York waters," New York's Department of Environmental Conservation said Hauke-Christian Dittrich/picture ...

A new species of hermit crab has been found to be a hermit no more. Off the coast of Japan, the crustacean has managed to find its forever home, by partnering up with a living coral that grows as the ...

Scientifically named Carcinus aestuarii, the green crab is the key ingredient of a beloved local dish called moeche ...

A highly invasive species of crab — capable of climbing over 13-foot-high concrete structures — has been spotted in the Pacific Northwest for the first time, wildlife officials said. A commercial ...

First it was murder hornets. Later, it was African clawed frogs. And don't forget the Japanese beetles. Now it seems Washington state has another invasive species problem — a European green crab was ...