Pachymatisma johnstonia, Iophonopsis nigricans. Site: Fair Head
 Pachymatisma johnstonia, Iophonopsis nigricans. Event number: 19850815/02. Site: Fair Head. 1985-08-15. Photograph © Ulster Museum. (2/8) 
 Ulster Museum (2026). Photograph of Pachymatisma johnstonia, Iophonopsis nigricans. Site: Fair Head. [In] Marine Biodiversity Data Portal - NI.
https://habitas.org/mbdp/sitephoto.php?item=niss_12418.jpg. Accessed on 2026-11-04