Nucula nucleus (Linnaeus, 1758)
N. Russia and Norway to South Africa, Mediterranean & Black Sea. Subtidal to continental shelf, in all kinds of sediments.
Original taxon: Arca nucleus.
Synonyms: argentea, margaritacea.
20m deep, on mud, off the Borj Jilij, Houmt Souk, Jerba, Tunisia. 9mm.
A specimen from English Channel.
At extreme low tide, in sand, Granville, Manche, SW. Normany, NW. France. 11mm.
« Nucula nucleus : Shell obliquely ovate, transverse, slightly triangular, smooth or obsoletely striated ; hinge with numerous, sharp, and erect teeth ; margin crenulated. » – S. V. Wood: A monograph of the Crag Mollusca vol. II, London 1851-1861, via BHL.
The animal in Forbes & Hanley: A history of British Mollusca and their shells vol. I, London 1853, plate P.
50m deep, off Poetto, Cagliari, S. Sardinia. 10mm..

— back to Nuculidae —