A squid with a novel type of reflective plates that form a built-in light it may use to confuse predators has been discovered by scientists in Hawaii.While other luminous sea creatures are known, the reflective plates on the Hawaiian bobtail squid differ from those of other animals, according to researchers at Kewalo Marine Laboratory, University of Hawaii-Manoa.The light itself is provided by colonies of luminescent bacteria that live on the squids, the researchers report in Friday's issue of the journal Science."Light organs are not uncommon in nature," observed Wendy J. Crookes, first author of the paper. "In this one the light organ does have a lens similar to an eye in some respects, but we don't really know its capabilities in terms of specifically directing light.""The light is subtle, but it's there," she added. "We think it's a counter-predatory camouflage."The two- to three-inch squids forage and mate at night and predators that eat them tend to hide in the sand, looking upward."We think it projects light down, and that looks like moonlight so the squid doesn't cast a shadow and is not silhouetted against the night sky," Crookes said.
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