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Old 01/11/2008, 11:17 PM   #12
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Join Date: Oct 2004
Location: Los Angeles, CA
Posts: 3,178
That's a Trapezia, an obligate commensal crab on lives on pocilloporid corals. It's harmless and even beneficial to its host.

Cheers, Leslie
So many worms, so little time...
Natural History Museum of Los Angeles County
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