| Citation | Gibson, R., B. Hextall and A. Rogers, 2001 Photographic Guide to the Sea and Shore Life of Britain and Northwest Europe. Oxford University Press Inc., New York. |
| Ref. | 108725 Gibson, R., B. Hextall and A. Rogers, 2001 |
| Page | 58 |
| Named Used as Valid | Pachymatisma johnstonia |
| Locality | |
| Distribution | Northwest Europe. |