Alcyonium digitatum, Caryophyllia smithii, Hydrallmania falcata, Clavelina lepadiformis. Site: N of Main Otter Rock, Skerries, Portrush
 Alcyonium digitatum, Caryophyllia smithii, Hydrallmania falcata, Clavelina lepadiformis. Event number: 19790618/03. Site: N of Main Otter Rock, Skerries, Portrush. 1979-06-18. Photograph © Ulster Museum. (4/12) 
 Ulster Museum (2026). Photograph of Alcyonium digitatum, Caryophyllia smithii, Hydrallmania falcata, Clavelina lepadiformis. Site: N of Main Otter Rock, Skerries, Portrush. [In] Marine Biodiversity Data Portal - NI.
https://habitas.org/mbdp/sitephoto.php?item=niss_1070.jpg. Accessed on 2026-11-04