English: Serpula vermicularis. "Look carefully to see the visible trap door (operculum) inside the tubes where its tentacular crowns are retracted in the tube."
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{{Information |Description={{en|1=''Serpula vermicularis''. "Look carefully to see the visible trap door (operculum) inside the tubes where its tentacular crowns are retracted in the tube."}} |Source=originally uploaded to '''Flickr''' as [
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