| Citation | Harvey-Clark, C., 1997 Eastern tidepool and reef: north-central Atlantic marinelife guide. Hancock House Publishers, 64pp. |
| Ref. | 7726 Harvey-Clark, C., 1997 |
| Page | 22 |
| Named Used as Valid | Hydractinia echinata |
| Locality | |
| Distribution | Florida to Subarctic. |