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| Usually
found alone. |
Usually
found alone. |
Usually
found in groups of many individual polyps. The polyps are joined
to one another. |
| An outer
ring of longer tentacles and an inner ring of much shorter tentacles. |
Various
arrangement of tentacles. Tentacles may be long or short. |
Two rows
of tentacles. Tentacles usually very short and of equal length. |
| Lives inside
a soft tube that it creates. |
Does not
live inside a tube. |
Does not
live inside a tube. |
