Pachymatisma johnstonia. Site: N of NE Large Skerrie, Skerries, Portrush
 Pachymatisma johnstonia. Event number: 19790619/03. Site: N of NE Large Skerrie, Skerries, Portrush. 1979-06-19. Photograph © Ulster Museum. (4/17) 
 Ulster Museum (2026). Photograph of Pachymatisma johnstonia. Site: N of NE Large Skerrie, Skerries, Portrush. [In] Marine Biodiversity Data Portal - NI.
https://habitas.org/mbdp/sitephoto.php?item=niss_1091.jpg. Accessed on 2026-11-04