Spondylus gaederopus is a species of marine bivalve mollusc, a thorny oyster in the family Spondylidae. This species is endemic to the Mediterranean Sea.S. gaederopus has low fecundity as they lay up to 404 858 ± 248 014 female eggs per season starting at the age of 3. Additionally, they live to be up to 18 years old.
Spondylus gaederopus attaches itself to the substrate with its lower valve, which is usually white, while the upper valve is usually purple. Specimens that are all white, or all purple do, however, exist.
The mollusc is edible, and is consumed in Sardinia.
Pernet, F., Malet, N., Pastoureaud, A., Vaquer, A., Quéré, C., & Dubroca, L. (2012). Marine diatoms sustain growth of bivalves in a mediterranean lagoon. Journal of Sea Research, 68, 20–32. https://doi.org/10.1016/j.seares.2011.11.004