Pachymatisma johnstonia, Alcyonium digitatum. Site: Ruecallan Archway (North Wall), Rathlin Island
 Pachymatisma johnstonia, Alcyonium digitatum. Event number: 20241014/01. Site: Ruecallan Archway (North Wall), Rathlin Island. 2024-10-14. Photograph © Kirsty Andrews. (10/68) 
 Kirsty Andrews (2026). Photograph of Pachymatisma johnstonia, Alcyonium digitatum. Site: Ruecallan Archway (North Wall), Rathlin Island. [In] Marine Biodiversity Data Portal - NI.
https://habitas.org/mbdp/sitephoto.php?item=kja2339.jpg. Accessed on 2026-11-03