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| Polymastia boletiformis. Event number: 19800616/01. Site: Bird Island Passage, Strangford Lough. 1980-06-16. Photograph © Ulster Museum. (4/19) |
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| Ulster Museum (2026). Photograph of Polymastia boletiformis. Site: Bird Island Passage, Strangford Lough. [In] Marine Biodiversity Data Portal - NI. https://habitas.org/mbdp/sitephoto.php?item=niss_1302.jpg. Accessed on 2026-11-04 |