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A purple crab stares down the camera in the Philippine island of Palawan in an undated picture. The colorful crustacean, dubbed Insulamon palawanense, is one of four new species in the Insulamon genus described in a recent study. (Photograph courtesy Hendrik Freitag) See more photos at National Geographic.com

Newly discovered purple crabs

Four new species of colorful crustaceans have been discovered in the Philippines, a recent study says. The crab's brilliant hues may simply help the species recognize its brethren, said study author Hendrik Freitag, of the Senckenberg Museum of Zoology in Dresden, Germany.