Antedon bifida, Buccinum undatum. Site: Bird Island Passage, Strangford Lough
 Antedon bifida, Buccinum undatum. Event number: 19830804/02. Site: Bird Island Passage, Strangford Lough. 1983-08-04. Photograph © David Erwin. (8/13) 
 David Erwin (2026). Photograph of Antedon bifida, Buccinum undatum. Site: Bird Island Passage, Strangford Lough. [In] Marine Biodiversity Data Portal - NI.
https://habitas.org/mbdp/sitephoto.php?item=niss_2725.jpg. Accessed on 2026-11-04