Polycera quadrilineata. Site: Rathlin Marina
 Polycera quadrilineata. Event number: 20221016/01. Site: Rathlin Marina. 2022-10-16. Photograph © Bernard Picton. (1/9) 
 Bernard Picton (2026). Photograph of Polycera quadrilineata. Site: Rathlin Marina. [In] Marine Biodiversity Data Portal - NI.
https://habitas.org/mbdp/sitephoto.php?item=_z227417.jpg. Accessed on 2026-11-03