Polycera quadrilineata. Site: S of Vidal Rock, Carlingford Lough
 Polycera quadrilineata. Event number: 19840606/03. Site: S of Vidal Rock, Carlingford Lough. 1984-06-06. Photograph © Christine Howson. (8/11) 
 Christine Howson (2026). Photograph of Polycera quadrilineata. Site: S of Vidal Rock, Carlingford Lough. [In] Marine Biodiversity Data Portal - NI.
https://habitas.org/mbdp/sitephoto.php?item=niss_6475.jpg. Accessed on 2026-11-04