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The entire wiki reimagined as a visual magazine with video discovery · Watch your interests come alive
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Bivalve shell
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A bivalve shell is the enveloping exoskeleton or shell of a bivalve mollusc, composed of two hinged halves or valves. The two half-shells, called the "right valve" and "left valve", are joined by a li
Two whole shells, one closed and one open, of the marine bivalve Abra alba
Two whole shells, one closed and one open, of the marine bivalve Abra alba
Live marine venerid cockles, Austrovenus stutchburyi from New Zealand
Live marine venerid cockles, Austrovenus stutchburyi from New Zealand
Paired valves of a fossil Spondylus shell (a "thorny oyster") showing the isodont, monomyarian, inequivalved condition, from the Pliocene deposits of
Paired valves of a fossil Spondylus shell (a "thorny oyster") showing the isodont, monomyarian, inequivalved condition, from the Pliocene deposits of Cyprus
The lower right portion of this image shows a Venerupis senegalensis with a distinct pallial sinus on the viewer's right side/ animal's right valve wh
The lower right portion of this image shows a Venerupis senegalensis with a distinct pallial sinus on the viewer's right side/ animal's right valve which points towards the animal's posterior
Periostracum
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The periostracum is a thin, organic coating that is the outermost layer of the shell of many shelled animals, including molluscs and brachiopods. Among molluscs, it is primarily seen in snails and cla
The shell of Stenotrema florida, a land snail or terrestrial gastropod. The periostracum of this species has minute hairs, giving the snail a velvety
The shell of Stenotrema florida, a land snail or terrestrial gastropod. The periostracum of this species has minute hairs, giving the snail a velvety feel
A yellowish tan periostracum is visible on the lower two thirds of this juvenile (8 cm) valve of the marine bivalve Spisula solidissima
A yellowish tan periostracum is visible on the lower two thirds of this juvenile (8 cm) valve of the marine bivalve Spisula solidissima
The dark periostracum is flaking off of this dried-out valve of the "ocean quahog", marine bivalve Arctica islandica, from Wales
The dark periostracum is flaking off of this dried-out valve of the "ocean quahog", marine bivalve Arctica islandica, from Wales
Fresher valves of Arctica islandica with periostracum intact. Note that the periostracum is partially worn off on the umbo, this is because the umbo i
Fresher valves of Arctica islandica with periostracum intact. Note that the periostracum is partially worn off on the umbo, this is because the umbo is older than the rest of the shell and also projects more: it has been exposed to more abrasion during the life of the clam