Tethya citrina, Clavelina lepadiformis. Site: Colin Rock, Strangford Lough
 Tethya citrina, Clavelina lepadiformis. Event number: 19800702/06. Site: Colin Rock, Strangford Lough. 1980-07-02. Photograph © Ulster Museum. (6/13) 
 Ulster Museum (2026). Photograph of Tethya citrina, Clavelina lepadiformis. Site: Colin Rock, Strangford Lough. [In] Marine Biodiversity Data Portal - NI.
https://habitas.org/mbdp/sitephoto.php?item=niss_1523.jpg. Accessed on 2026-11-04