There is a crab that looks very similar to yours that lives inside the flame scallop. I don't know if its a symbiotic relationship, but they usually don't seem to cause any harm to a healthy live scallop. I had one in a scallop for over a year. I don't know what its called though. Most people only notice them after a scallop has died and has been eaten.
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72 gal bowfromt mixed reef sps dominated, 25 gal mineral mud type sump/refugium Skimmerless
2x250 14000k phoenix hqi 2x96 pc actinic, 50x flow
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