Porella compressa. Site: SE Altacarry Head, Rathlin Island
 Porella compressa. Event number: 19850628/01. Site: SE Altacarry Head, Rathlin Island. 1985-06-28. Photograph © Ulster Museum. (8/9) 
 Ulster Museum (2026). Photograph of Porella compressa. Site: SE Altacarry Head, Rathlin Island. [In] Marine Biodiversity Data Portal - NI.
https://habitas.org/mbdp/sitephoto.php?item=niss_10453.jpg. Accessed on 2026-11-04