Metridium senile. Site: N Reagh Island, Strangford Lough
 Metridium senile. Event number: 19830810/04. Site: N Reagh Island, Strangford Lough. 1983-08-10. Photograph © David Erwin. (3/4) 
 David Erwin (2026). Photograph of Metridium senile. Site: N Reagh Island, Strangford Lough. [In] Marine Biodiversity Data Portal - NI.
https://habitas.org/mbdp/sitephoto.php?item=niss_2881.jpg. Accessed on 2026-11-04