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Old 01/12/2008, 12:17 AM
LeslieH LeslieH is offline
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Join Date: Oct 2004
Location: Los Angeles, CA
Posts: 1,841
That's a Trapezia, an obligate commensal crab on lives on pocilloporid corals. It's harmless and even beneficial to its host.
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Cheers, Leslie
So many worms, so little time...
Natural History Museum of Los Angeles County