Polymastia penicillus, Crisia eburnea. Site: Skerriagh, Rathlin Island
 Polymastia penicillus, Crisia eburnea. Event number: 20240521/01. Site: Skerriagh, Rathlin Island. 2024-05-21. Photograph © Erling Svensen. (15/81) 
 Erling Svensen (2026). Photograph of Polymastia penicillus, Crisia eburnea. Site: Skerriagh, Rathlin Island. [In] Marine Biodiversity Data Portal - NI.
https://habitas.org/mbdp/sitephoto.php?item=es2024_165.jpg. Accessed on 2026-11-03