Lot Eastonia rugosa 10 Pcs Seashell Bivalve Trough Shell Duck Clam Venus Comb Triangle Mussel Venerid

Only about 0.90 Euros per Shell ! Lot 10 Eastonia rugosa mm 40-60 Seashell Bivalve Trough Shell Duck Clam Venus Comb Triangle Mussel Venerid, single valves, second choice (beached).
Rare, endemic species, believed to have disappeared from the Tyrrhenian Sea.
Also available bivalves, at this link.
Family: Mactridae.
Common name: Rugose Mactra.
Syn. Mactra rugosa, Eastonia locardi, Lutraria rugosa, Spisula lamarckii.

Eastonia rugosa (Helbling, 1779) is a mollusc of Bivalves class belonging to the Mactridae family. It lives mainly on the North African coasts starting from Senegal and then up the Atlantic Ocean to the north, up to the south of Portugal. Across the Strait of Gibraltar it has spread widely in the coasts of Morocco, Algeria and Tunisia, and therefore from southern Spain to the Balearic Islands.
In Italy it has always been abundant in Sicily, while its distribution along the peninsula is somewhat uncertain. The data relating to its presence are rather generic and suggest that the species had lived in ancient times in the central Tyrrhenian Sea, with precision in the post-Pliocene period (about 2.5 million years ago) and that in recent times Eastonia rugosa had disappeared.
Around the end of the 1800s, the malacologist Romolo Meli announced the discovery of two valves (preserved in the Museum collection) in Anzio and Foglino (Nettuno) and some other specimens in the area of ​​Civitavecchia, but the absence of live finds or shells with the presence of soft parts led the scholar to write in his publication: "... presence of this species in our shoreline, which would be rare and perhaps disappearing from this coast".
Between the late 1990s and the beginning of the new millennium Eastonia rugosa reappeared on the Lazio coasts with new discoveries, in particular in the area between Torre Astura (Nettuno), Palo laziale (Ladispoli), Torre Flavia (Cerveteri) and, subsequently (2007), in Tarquinia and in Tuscany. Today the species seems to be expanding again and on the coasts of the Lazio coast one can often find thousands of these white shells, whose presence could be due to an increase in water temperature.
At the Civic Museum of Zoology there are currently exhibited some valves from the Palo Laziale, including one of considerable size (69 mm) and one with the intact ligament.