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Spiders from Mars

Arrow crabs are small, spider-like crabs that live on coral reefs.(CLICK IMAGE TO OPEN SLIDESHOW WITH MORE WINNING PHOTOS FROM THE CONTEST)
(Carl Salonen)

"Two arrow crabs in a cup coral, lit from behind. It seemed to be a scene from a 1960s monster movie," wrote Carl Salonen of his image, a winning selection in the Portraits of Planet Ocean Flickr contest. Arrow crabs (Stenorhynchus seticornis) are small, spider-like crabs that live on coral reefs. Nocturnal animals, they leave their homes—often rocky crevices, sponges, corals, anemones or urchins—to forage for worms, detritus and algae at night. See more winning photos.