Polymastia boletiformis, Okenia aspersa, Synoicum incrustatum. Site: Skerries,  Portrush
 Polymastia boletiformis, Okenia aspersa, Synoicum incrustatum. Event number: 20210605/01. Site: Skerries, Portrush. 2021-06-05. Photograph © Bernard Picton. (37/59) 
 Bernard Picton (2026). Photograph of Polymastia boletiformis, Okenia aspersa, Synoicum incrustatum. Site: Skerries, Portrush. [In] Marine Biodiversity Data Portal - NI.
https://habitas.org/mbdp/sitephoto.php?item=_b216605.jpg. Accessed on 2026-11-04