It's hard to definitively say exactly what kind of anemone this is, as little taxonomy has been done on them. They're commonly seen at night in sand in the southern Caribbean, and I'm always on the lookout for them when returning from a night dive. They're sensitive to light, and this one is retracting into its tube because of my dive light.
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Banded Tube-Dwelling Anemone (Arachnanthus nocturnus)
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