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Spondylus is a genus of bivalve mollusks, the only genus in the family Spondylidae. As well as being the systematic or scientific name, Spondylus is also the most often used common name for these animals, though they are also known as thorny oysters, spiny oysters, and as spondylids. The meat of these bivalves is edible. They are not closely related to true oysters (family Ostreidae), however they do cement themselves to rocks, rather than attach themselves by a byssus. Spondylus shells are much sought after by collectors, and a lively commercial market exists in them. Undated, no illustrator credited.
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