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| Polycera quadrilineata. Event number: 20200906/01. Site: S of Ballyhenry Island, Strangford Lough. 2020-09-06. Photograph © Bernard Picton. (19/22) |
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| Bernard Picton (2026). Photograph of Polycera quadrilineata. Site: S of Ballyhenry Island, Strangford Lough. [In] Marine Biodiversity Data Portal - NI. https://habitas.org/mbdp/sitephoto.php?item=_b205808.jpg. Accessed on 2026-11-04 |