| Number seen/Abundance | Date | Location | Comments | Recorded by |
|---|---|---|---|---|
| v. abundant | 2007-03-21 | West Hoe by water front pub, Plymouth |
Encrusting rocks upper-lower shore | Jon Parr |
| abunant | 2005-08-14 | rocky coast on coastal walk between compass and castle cove dartmouth (westside) increased sun exposure till sundown no fresh H2O inlets. |
high-lowershore | Sonia Rowley |
| Abundant >100 per 0.01 m squared | 2008-07-09 | Rocks at Westport, Kintyre, Argyll & Bute |
Robin Harvey | |
| cca,. 100 in 18x18 cm square | 2009-03-01 | Sveti Filip i Jakov Sveti Filip i Jakov, Croatia |
Extremely large specimens | Ivana Zubak |
| 05/02/2011 | Gyllyngvase Beach Rocky shore to the left and right hand sides of the beach. |
Kristie Wilkinson |