Obelia longissima. Site: Belfast Marina
 Obelia longissima. Event number: 20220907/01. Site: Belfast Marina. 2022-09-07. Photograph © Bernard Picton. (28/29) 
 Bernard Picton (2026). Photograph of Obelia longissima. Site: Belfast Marina. [In] Marine Biodiversity Data Portal - NI.
https://habitas.org/mbdp/sitephoto.php?item=_z221836.jpg. Accessed on 2026-11-04