Halopteris catharina. Site: SE of St.John's Point
 Halopteris catharina. Event number: 19830503/02. Site: SE of St.John's Point. 1983-05-03. Photograph © Christine Howson. (2/10) 
 Christine Howson (2026). Photograph of Halopteris catharina. Site: SE of St.John's Point. [In] Marine Biodiversity Data Portal - NI.
https://habitas.org/mbdp/sitephoto.php?item=niss_1543.jpg. Accessed on 2026-11-04