image: Testudinalia testudinalis. On the inside of blue mussel shells <i>Mytilus edulis</i>, Strangford Lough, Northern Ireland.

Testudinalia testudinalis (O. F. Müller, 1776)
On the inside of blue mussel shells Mytilus edulis, Strangford Lough, Northern Ireland. Photograph © Bernard Picton

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 Bernard Picton (2026). Photograph of Testudinalia testudinalis. (O. F. Müller, 1776). [In] Marine Biodiversity Data Portal - NI.
https://habitas.org/mbdp/photo.php?item=p7080155. Accessed on 2026-11-04