Pachymatisma johnstonia, Alcyonium digitatum, Nemertesia antennina, Nemertesia ramosa. Site: Castle Head, Rathlin Island
 Pachymatisma johnstonia, Alcyonium digitatum, Nemertesia antennina, Nemertesia ramosa. Event number: 19850626/01. Site: Castle Head, Rathlin Island. 1985-06-26. Photograph © Ulster Museum. (3/10) 
 Ulster Museum (2026). Photograph of Pachymatisma johnstonia, Alcyonium digitatum, Nemertesia antennina, Nemertesia ramosa. Site: Castle Head, Rathlin Island. [In] Marine Biodiversity Data Portal - NI.
https://habitas.org/mbdp/sitephoto.php?item=niss_10123.jpg. Accessed on 2026-11-04