Cereus pedunculatus, Halecium halecinum. Site: W of Watson Rocks, Carlingford Lough
 Cereus pedunculatus, Halecium halecinum. Event number: 19840607/08. Site: W of Watson Rocks, Carlingford Lough. 1984-06-07. Photograph © Christine Howson. (4/10) 
 Christine Howson (2026). Photograph of Cereus pedunculatus, Halecium halecinum. Site: W of Watson Rocks, Carlingford Lough. [In] Marine Biodiversity Data Portal - NI.
https://habitas.org/mbdp/sitephoto.php?item=niss_6619.jpg. Accessed on 2026-11-04