Polymastia boletiformis. Site: Church Bay, Rathlin Island 
 Polymastia boletiformis. Event number: 19850703/01. Site: Church Bay, Rathlin Island. 1985-07-03. Photograph © Ulster Museum. (7/7) 
 Ulster Museum (2026). Photograph of Polymastia boletiformis. Site: Church Bay, Rathlin Island. [In] Marine Biodiversity Data Portal - NI.
https://habitas.org/mbdp/sitephoto.php?item=niss_10687.jpg. Accessed on 2026-11-04