Polybius holsatus. Site: NW of Helens Bay, Belfast Lough
 Polybius holsatus. Event number: 19840515/02. Site: NW of Helens Bay, Belfast Lough. 1984-05-15. Photograph © Bernard Picton. (3/6) 
 Bernard Picton (2026). Photograph of Polybius holsatus. Site: NW of Helens Bay, Belfast Lough. [In] Marine Biodiversity Data Portal - NI.
https://habitas.org/mbdp/sitephoto.php?item=niss_5991.jpg. Accessed on 2026-11-04