^+1 It is a species of crab within genus Petrolisthes (Porcelain crab). It will be fine in your reef. May have been in the shell because it was hosting those shore anemones.
Porcelain. Claws don't close all the way, and they're filter feeders. You can keep him.
Gotta ask, though... Why'd you bring home a random shell full of anemones? For the anemones?
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