Ostrea stentina Payraudeau, 1826
Galicia to Cameroon (where was described an Ostrea guineensis), Canarias to Mediterranean, Gulf of St-Lawrence to Antilles (under the taxon Ostrea equestris), Mascarenhas, New Zealand (Ostrea aupouria)…
Original taxon: Ostrea stentina. Syns: curvata, parenzani.
1m deep, Chioggia, Venezia, NE. Italy. 49mm.
« Ostrea stentina : The most marked feature is the strong crenellation of the margins; the teeth interlock with each other; the species binds to shells in preference to other bodies; I often found it on Fusus lignarius. » – B. C. Payraudeau: Catalogue des Annélides et des Mollusques de Corse, Paris 1826, via BHL.
The crenellation, in a specimen from breakwater, Capitania maritima of Santa-Cruz, Tenerife, Canarias. Original picture provided by B. Jobson for iNaturalist – (CC BY).
Many synonyms. Among them, capsa could become the right epithet, as it was given in 1807 by Fischer von Waldheim. Awaiting a declaration of the ICZN, stentina remains in use.
Above, a specimen from New Zealand. Uretiti Beach, Whangarei area, North Island, 48mm.
Bay of Orhaniye, Bozburun Peninsula, Marmaris ilçe, Muğla Province, SW. Turkey. Original picture provided by wingwatcher48 for iNaturalist – (CC BY-NC).

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